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SLOW_EWS_RESPONSE

Event ID 1008: Slow EWS Response Times

Complete troubleshooting guide for Exchange Server Event ID 1008 slow EWS response times affecting third-party applications, mobile devices, and calendar operations.

Medha Cloud
Medha Cloud Exchange Server Team
Exchange Database Recovery Team••8 min read

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Error Overview

Event ID 1008: Slow EWS Response Times

"EWS request for mailbox user@domain.com took 45,230 ms to complete. Operation: GetItem. Request processing exceeded the threshold of 30000 ms. Client application: MacOutlook/16.x. This may indicate server performance issues."

What This Error Means

Event ID 1008 indicates that Exchange Web Services requests are taking longer than expected to complete. EWS is the backbone for many Exchange integrations including Outlook for Mac, mobile sync, third-party applications, and internal Exchange features like Free/Busy availability.

EWS Operations Affected

  • • GetItem / GetFolder operations
  • • SyncFolderItems / SyncFolderHierarchy
  • • FindItem / FindFolder
  • • GetUserAvailability (Free/Busy)
  • • CreateItem / UpdateItem

Response Time Thresholds

  • • <500ms: Excellent
  • • 500ms-2s: Good
  • • 2s-5s: Acceptable
  • • 5s-30s: Degraded
  • • >30s: Critical/Timeout
⚠️

Version Notice

This guide applies to Exchange Server 2016, 2019, and Subscription Edition. EWS is being deprecated in favor of Microsoft Graph API for cloud environments, but remains critical for on-premises Exchange and hybrid deployments.

Symptoms & Detection

User-Reported Symptoms

  • ✗Outlook for Mac extremely slow
  • ✗Free/Busy information unavailable
  • ✗Third-party apps failing to sync
  • ✗Out of Office not working
  • ✗Calendar sharing failures

Administrator Detection

  • →Event ID 1008 in Application log
  • →High latency in EWS performance counters
  • →IIS logs showing long request times
  • →Throttling events in event log
  • →MSExchangeServicesAppPool issues

Event Log Entry Example

Log Name:      Application
Source:        MSExchange Web Services
Event ID:      1008
Level:         Warning
Description:   The EWS request completed but exceeded expected time.

               Operation: SyncFolderItems
               Mailbox: user@contoso.com
               Client Application: MacOutlook/16.54
               Client IP: 10.0.1.50
               Request Time: 45,230 ms
               Expected Maximum: 30,000 ms

               Request details:
               - Items returned: 500
               - Folders synced: 1
               - Database: Mailbox Database 01

               This may indicate database performance issues,
               large mailbox size, or server resource constraints.

Common Causes

1

Database Performance Issues

EWS operations ultimately read from and write to the mailbox database. Slow database I/O, high RPC latency, or memory pressure directly impacts EWS response times.

Correlation: Check for Event ID 1018 (database I/O) and Event ID 4999 (RPC latency) occurring around the same time.
2

Aggressive Third-Party Applications

Third-party sync applications, backup software, or custom integrations making excessive EWS calls can overwhelm the server and cause throttling for all users.

Identify: Check IIS logs for high-frequency clients, review EWS application identifiers in event logs.
3

EWS Throttling Policies

Default or overly restrictive throttling policies limit concurrent connections and request rates. When limits are hit, requests are delayed, causing slow response times.

Check: Review EwsMaxConcurrency, EwsMaxSubscriptions, and EwsMaxBurst throttling policy settings.
4

Large Mailboxes and Folders

Mailboxes with very large folders (inbox with 50,000+ items), many folders, or excessive item sizes cause EWS sync operations to take much longer than normal.

Solution: Implement mailbox quotas, educate users on archiving, use retention policies to manage growth.
5

IIS Application Pool Issues

The MSExchangeServicesAppPool handles EWS requests. Memory pressure, recycling issues, or configuration problems with this app pool directly impact EWS performance.

Monitor: Check w3wp.exe CPU/memory for the services app pool, review IIS recycling logs.

Diagnostic Steps

Step 1: Check EWS Performance Counters

# Check EWS-related performance counters
$server = $env:COMPUTERNAME

$ewsCounters = @(
    "\$server\MSExchange Web Services(*)Average Response Time",
    "\$server\MSExchange Web Services(*)Requests/sec",
    "\$server\MSExchange Web Services(*)Items Read/sec",
    "\$server\MSExchange Web Services(*)Items Sent/sec",
    "\$server\MSExchange Availability ServiceAvailability Requests (sec)",
    "\$server\MSExchange Availability ServiceAverage Time to Process a Free Busy Request"
)

Write-Host "Collecting EWS performance data..." -ForegroundColor Cyan
Get-Counter -Counter $ewsCounters -SampleInterval 5 -MaxSamples 6 |
    ForEach-Object { $_.CounterSamples } |
    Where-Object { $_.CookedValue -gt 0 } |
    Select-Object @{N='Counter';E={$_.Path.Split('')[-1]}},
                  @{N='Value';E={[math]::Round($_.CookedValue,2)}} |
    Format-Table -AutoSize

# Check IIS request execution time
Get-Counter "\$server\W3SVC_W3WP(*)Active Requests" |
    Select-Object -ExpandProperty CounterSamples |
    Where-Object { $_.InstanceName -match "services" } |
    Format-Table InstanceName, CookedValue

Step 2: Analyze IIS Logs for Slow Requests

# Parse IIS logs for slow EWS requests
$logPath = "C:inetpublogsLogFilesW3SVC1"  # Adjust for your IIS site
$today = Get-Date -Format "yyMMdd"
$logFile = Get-ChildItem $logPath -Filter "u_ex$today*.log" | Sort-Object LastWriteTime -Descending | Select-Object -First 1

if ($logFile) {
    Write-Host "Analyzing: $($logFile.FullName)" -ForegroundColor Cyan

    # Find slow EWS requests (time-taken > 5000ms)
    $slowRequests = Get-Content $logFile.FullName |
        Where-Object {$_ -notmatch "^#" -and $_ -match "/EWS/"} |
        ForEach-Object {
            $fields = $_ -split " "
            if ($fields.Count -gt 14) {
                $timeTaken = [int]$fields[-1]  # Last field is typically time-taken
                if ($timeTaken -gt 5000) {
                    [PSCustomObject]@{
                        Time = $fields[1]
                        ClientIP = $fields[2]
                        Method = $fields[3]
                        URI = $fields[4]
                        Status = $fields[11]
                        TimeTaken = $timeTaken
                    }
                }
            }
        }

    Write-Host "=== Slow EWS Requests (>5 seconds) ===" -ForegroundColor Yellow
    $slowRequests | Sort-Object TimeTaken -Descending | Select-Object -First 20 |
        Format-Table -AutoSize

    # Group by client IP to find problematic clients
    Write-Host "`n=== Slow Requests by Client IP ===" -ForegroundColor Yellow
    $slowRequests | Group-Object ClientIP |
        Sort-Object Count -Descending |
        Select-Object @{N='ClientIP';E={$_.Name}}, Count |
        Select-Object -First 10 | Format-Table
}

Step 3: Check EWS Throttling Status

# Check current throttling policies
Get-ThrottlingPolicy | Where-Object {$_.IsDefault -eq $true} |
    Select-Object Name, EwsMaxConcurrency, EwsMaxSubscriptions, EwsMaxBurst,
    EwsCutoffBalance, EwsRechargeRate | Format-List

# Check for throttling events in event log
$throttlingEvents = Get-WinEvent -FilterHashtable @{
    LogName = 'Application'
    ProviderName = 'MSExchange*'
    StartTime = (Get-Date).AddHours(-24)
} -ErrorAction SilentlyContinue |
    Where-Object {$_.Message -match "throttl|budget|exceeded"}

if ($throttlingEvents) {
    Write-Host "=== Throttling Events (Last 24 Hours) ===" -ForegroundColor Yellow
    $throttlingEvents | Select-Object TimeCreated, Id, Message | Format-Table -Wrap
} else {
    Write-Host "No throttling events found" -ForegroundColor Green
}

# Check specific user's throttling status
$testUser = "user@domain.com"
# Get-ThrottlingPolicyAssociation -Identity $testUser-Identity $testUser

# View EWS logs for throttled requests
$ewsLogPath = (Get-ItemProperty 'HKLM:SOFTWAREMicrosoftExchangeServer15Setup').MsiInstallPath + "LoggingEws"
if (Test-Path $ewsLogPath) {
    Write-Host "`nEWS logs location: $ewsLogPath"
    Get-ChildItem $ewsLogPath -Filter "*.log" | Sort-Object LastWriteTime -Descending | Select-Object -First 5
}

Step 4: Test EWS Connectivity

# Test EWS using Test-WebServicesConnectivity
$testMailbox = "testuser@domain.com"
$cred = Get-Credential

# Test EWS connectivity
Test-WebServicesConnectivity -Identity $testMailbox -MailboxCredential $cred |
    Format-Table Scenario, Result, Latency, Error -AutoSize

# Test Autodiscover (EWS relies on this)
Test-OutlookWebServices -Identity $testMailbox -TargetAddress $testMailbox -MailboxCredential $cred |
    Format-Table Type, Url, Result -AutoSize

# Manual EWS endpoint test
$ewsUrl = "https://mail.domain.com/EWS/Exchange.asmx"

try {
    $stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
    $response = Invoke-WebRequest -Uri $ewsUrl -Method Get -Credential $cred -TimeoutSec 30
    $stopwatch.Stop()

    Write-Host "EWS endpoint response: $($response.StatusCode)" -ForegroundColor Green
    Write-Host "Response time: $($stopwatch.ElapsedMilliseconds) ms"
} catch {
    Write-Host "EWS endpoint test failed: $_" -ForegroundColor Red
}

# Check EWS virtual directory configuration
Get-WebServicesVirtualDirectory | Select-Object Server, InternalUrl, ExternalUrl,
    InternalAuthenticationMethods, ExternalAuthenticationMethods | Format-List
💡

Pro Tip

Use Microsoft's Remote Connectivity Analyzer (testconnectivity.microsoft.com) to test EWS from an external perspective. This helps identify whether the issue is internal server performance or external connectivity.

Quick Fix

Immediate EWS Performance Improvement

These steps can provide quick relief for EWS performance issues:

# Step 1: Recycle the EWS application pool
Import-Module WebAdministration
Restart-WebAppPool -Name "MSExchangeServicesAppPool"
Write-Host "MSExchangeServicesAppPool recycled" -ForegroundColor Green

# Step 2: Clear EWS connection cache
# Restart the IIS service (more disruptive but clears all connections)
# iisreset /noforce

# Step 3: Increase throttling limits temporarily for testing
# Note: This is for testing only - revert after troubleshooting
$policy = Get-ThrottlingPolicy | Where-Object {$_.IsDefault}

# View current limits
Write-Host "Current EWS limits:" -ForegroundColor Yellow
Write-Host "  EwsMaxConcurrency: $($policy.EwsMaxConcurrency)"
Write-Host "  EwsMaxSubscriptions: $($policy.EwsMaxSubscriptions)"

# To temporarily increase limits (create new policy):
# New-ThrottlingPolicy -Name "EWSTestPolicy" -EwsMaxConcurrency 50 -EwsMaxSubscriptions 50-Name "EWSTestPolicy" -EwsMaxConcurrency 50 -EwsMaxSubscriptions 50

# Step 4: Check for and block aggressive clients
# Review IIS logs for high-frequency EWS callers (done in diagnosis)
# Consider blocking problematic client IPs temporarily at firewall

# Step 5: Verify backend health
# EWS depends on database performance
$dbHealth = Get-MailboxDatabaseCopyStatus * |
    Where-Object {$_.Status -eq "Mounted"} |
    Select-Object Name, Status, CopyQueueLength

Write-Host "`nDatabase Health:" -ForegroundColor Cyan
$dbHealth | Format-Table -AutoSize

Note: Recycling the app pool causes brief interruption to EWS clients. They will automatically reconnect, but may experience a momentary error.

Detailed Solutions

Solution 1: Optimize Throttling Policies

Adjust throttling policies to balance protection with performance:

# View all throttling policies
Get-ThrottlingPolicy | Select-Object Name, IsDefault, EwsMaxConcurrency,
    EwsMaxSubscriptions, EwsMaxBurst | Format-Table -AutoSize

# Create an optimized policy for heavy EWS users
New-ThrottlingPolicy -Name "EWSPowerUsers" -EwsMaxConcurrency 20 -EwsMaxSubscriptions 20 -EwsMaxBurst 300000 -EwsCutoffBalance 3000000 -EwsRechargeRate 900000

# Apply to specific users or service accounts
Set-Mailbox -Identity "ewsserviceaccount@domain.com" -ThrottlingPolicy "EWSPowerUsers"

# For applications that need unlimited EWS access (use carefully!)
New-ThrottlingPolicy -Name "EWSUnlimited" -EwsMaxConcurrency $null -EwsMaxSubscriptions $null -EwsMaxBurst $null

# Monitor throttling budgets
Get-ThrottlingPolicy | Where-Object {$_.Name -eq "EWSPowerUsers"} | Format-List

# Check user's effective throttling policy
Get-Mailbox "user@domain.com" | Select-Object ThrottlingPolicy

# Throttling policy reference:
Write-Host "`n=== Throttling Policy Values Guide ===" -ForegroundColor Cyan
Write-Host "EwsMaxConcurrency: Max simultaneous EWS connections (default: 10)"
Write-Host "EwsMaxSubscriptions: Max push/streaming subscriptions (default: 5000)"
Write-Host "EwsMaxBurst: Max EWS calls in short period before throttling"
Write-Host "EwsCutoffBalance: Budget level where requests start being rejected"
Write-Host "EwsRechargeRate: How fast the budget replenishes"

Solution 2: Identify and Control Heavy EWS Clients

Find and manage applications making excessive EWS requests:

# Analyze EWS logs for heavy users
$ewsLogPath = (Get-ItemProperty 'HKLM:SOFTWAREMicrosoftExchangeServer15Setup').MsiInstallPath + "LoggingEws"

$recentLog = Get-ChildItem $ewsLogPath -Filter "*.log" |
    Sort-Object LastWriteTime -Descending |
    Select-Object -First 1

if ($recentLog) {
    Write-Host "Analyzing: $($recentLog.FullName)" -ForegroundColor Cyan

    $logData = Import-Csv $recentLog.FullName

    # Group by client application
    Write-Host "`n=== EWS Requests by Application ===" -ForegroundColor Yellow
    $logData | Group-Object ClientApplicationId |
        Sort-Object Count -Descending |
        Select-Object @{N='Application';E={$_.Name}}, Count |
        Select-Object -First 10 | Format-Table

    # Find longest-running requests
    Write-Host "`n=== Longest EWS Requests ===" -ForegroundColor Yellow
    $logData | Sort-Object {[int]$_.TotalTime} -Descending |
        Select-Object TimeStamp, Action, TotalTime, ClientApplicationId |
        Select-Object -First 10 | Format-Table
}

# Parse IIS logs for application user-agents
$iisLogPath = "C:inetpublogsLogFilesW3SVC1"
$latestLog = Get-ChildItem $iisLogPath -Filter "*.log" | Sort-Object LastWriteTime -Descending | Select-Object -First 1

# Get unique user agents hitting EWS
Get-Content $latestLog.FullName |
    Where-Object {$_ -notmatch "^#" -and $_ -match "/EWS/"} |
    ForEach-Object {
        ($_ -split " ")[9]  # User-agent field position
    } | Group-Object | Sort-Object Count -Descending |
    Select-Object Name, Count -First 10

# Block problematic applications (IIS request filtering)
# Import-Module WebAdministration
# Add-WebConfigurationProperty -PSPath 'MACHINE/WEBROOT/APPHOST/Default Web Site/EWS' -Filter "system.webServer/security/requestFiltering/filteringRules" -Name "." -Value @{name="BlockBadClient";scanAllRaw="true";scanUrl="false"}-PSPath 'MACHINE/WEBROOT/APPHOST/Default Web Site/EWS' -Filter "system.webServer/security/requestFiltering/filteringRules" -Name "." -Value @{name="BlockBadClient";scanAllRaw="true";scanUrl="false"}

Solution 3: Optimize EWS Application Pool

Configure the IIS application pool for optimal EWS performance:

Import-Module WebAdministration

# Check current app pool configuration
$poolName = "MSExchangeServicesAppPool"
$pool = Get-ItemProperty "IIS:AppPools$poolName"

Write-Host "=== Current App Pool Settings ===" -ForegroundColor Cyan
Write-Host "Pool Name: $poolName"
Write-Host "Auto Start: $($pool.autoStart)"
Write-Host "Start Mode: $($pool.startMode)"
Write-Host "Worker Processes: $($pool.processModel.maxProcesses)"
Write-Host "Idle Timeout: $($pool.processModel.idleTimeout)"
Write-Host "Recycling Time: $($pool.recycling.periodicRestart.time)"

# Optimize settings for heavy EWS workloads

# Increase queue length
Set-ItemProperty "IIS:AppPools$poolName" -Name queueLength -Value 5000

# Disable idle timeout (EWS needs to stay warm)
Set-ItemProperty "IIS:AppPools$poolName" -Name processModel.idleTimeout -Value ([TimeSpan]::Zero)

# Set recycling to off-peak hours only
Clear-ItemProperty "IIS:AppPools$poolName" -Name recycling.periodicRestart.schedule
Set-ItemProperty "IIS:AppPools$poolName" -Name recycling.periodicRestart.schedule -Value @{value="03:00:00"00:00"}

# Disable periodic recycling based on requests (can cause issues under load)
Set-ItemProperty "IIS:AppPools$poolName" -Name recycling.periodicRestart.requests -Value 0

# Increase rapid fail protection threshold
Set-ItemProperty "IIS:AppPools$poolName" -Name failure.rapidFailProtectionMaxCrashes -Value 10

# Verify changes
Write-Host "`n=== Updated Settings ===" -ForegroundColor Green
Get-ItemProperty "IIS:AppPools$poolName" | Select-Object name, queueLength, state |
    Format-Table -AutoSize

Solution 4: Address Large Mailbox Issues

Large mailboxes with huge folders cause slow EWS sync operations:

# Find mailboxes with large folders
$largeMailboxes = Get-Mailbox -ResultSize 100 | ForEach-Object {
    $stats = Get-MailboxFolderStatistics $_.Identity -ErrorAction SilentlyContinue
    $largestFolder = $stats | Sort-Object ItemsInFolder -Descending | Select-Object -First 1

    if ($largestFolder.ItemsInFolder -gt 10000) {
        [PSCustomObject]@{
            Mailbox = $_.DisplayName
            LargestFolder = $largestFolder.Name
            Items = $largestFolder.ItemsInFolder
            FolderSize = $largestFolder.FolderSize
        }
    }
}

Write-Host "=== Mailboxes with Large Folders (>10,000 items) ==="000 items) ===" -ForegroundColor Yellow
$largeMailboxes | Sort-Object Items -Descending | Format-Table -AutoSize

# Check for problematic folder types
Get-Mailbox -ResultSize 50 | ForEach-Object {
    $inbox = Get-MailboxFolderStatistics $_.Identity -FolderScope Inbox -ErrorAction SilentlyContinue
    $sentItems = Get-MailboxFolderStatistics $_.Identity -FolderScope SentItems -ErrorAction SilentlyContinue
    $deletedItems = Get-MailboxFolderStatistics $_.Identity -FolderScope DeletedItems -ErrorAction SilentlyContinue

    if ($inbox.ItemsInFolder -gt 50000 -or $deletedItems.ItemsInFolder -gt 50000) {
        [PSCustomObject]@{
            Mailbox = $_.DisplayName
            Inbox = $inbox.ItemsInFolder
            SentItems = $sentItems.ItemsInFolder
            DeletedItems = $deletedItems.ItemsInFolder
        }
    }
} | Format-Table -AutoSize

# Implement retention policies to manage folder sizes
# New-RetentionPolicyTag -Name "Delete-30Days" -Type DeletedItems -RetentionEnabled $true -RetentionAction PermanentlyDelete -AgeLimitForRetention 30-Name "Delete-30Days" -Type DeletedItems -RetentionEnabled $true -RetentionAction PermanentlyDelete -AgeLimitForRetention 30

# Enable archive for heavy users
# Enable-Mailbox -Identity "user@domain.com" -Archive-Identity "user@domain.com" -Archive

# Run mailbox folder repair for corrupted large folders
# New-MailboxRepairRequest -Mailbox "user@domain.com" -CorruptionType FolderView-Mailbox "user@domain.com" -CorruptionType FolderView
🚨

Danger Zone

Be cautious when creating "unlimited" throttling policies. A misbehaving application with no throttling can overwhelm Exchange and affect all users. Only apply unlimited policies to well-tested, trusted applications.

Verification Steps

Verify EWS Performance Improvement

# Comprehensive EWS health verification
$server = $env:COMPUTERNAME

Write-Host "=== EWS Performance Verification ===" -ForegroundColor Cyan

# Test EWS response time
$ewsUrl = "https://$server/EWS/Exchange.asmx"
$times = @()

for ($i = 1; $i -le 5; $i++) {
    $stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
    try {
        $null = Invoke-WebRequest -Uri $ewsUrl -Method Head -UseDefaultCredentials -TimeoutSec 30
        $stopwatch.Stop()
        $times += $stopwatch.ElapsedMilliseconds
        Write-Host "Test $i : $($stopwatch.ElapsedMilliseconds) ms"$stopwatch.ElapsedMilliseconds) ms" -ForegroundColor Green
    } catch {
        Write-Host "Test $i : Failed - $_"$_" -ForegroundColor Red
    }
    Start-Sleep -Seconds 2
}

$avgTime = ($times | Measure-Object -Average).Average
Write-Host "`nAverage response time: $([math]::Round($avgTime,0)) ms"0)) ms"

if ($avgTime -lt 1000) {
    Write-Host "Status: HEALTHY" -ForegroundColor Green
} elseif ($avgTime -lt 5000) {
    Write-Host "Status: ACCEPTABLE" -ForegroundColor Yellow
} else {
    Write-Host "Status: NEEDS ATTENTION" -ForegroundColor Red
}

# Check for recent slow EWS events
$recentEvents = Get-WinEvent -FilterHashtable @{
    LogName = 'Application'
    ProviderName = 'MSExchange Web Services'
    Level = 2, 3
    StartTime = (Get-Date).AddHours(-24)
} -ErrorAction SilentlyContinue

if ($recentEvents) {
    Write-Host "`nWARNING: $($recentEvents.Count) EWS warning/error events in last 24 hours"24 hours" -ForegroundColor Yellow
} else {
    Write-Host "`nNo EWS errors in last 24 hours" -ForegroundColor Green
}

# Check EWS performance counters
$counters = Get-Counter "\$server\MSExchange Web Services(*)Average Response Time" -ErrorAction SilentlyContinue
if ($counters) {
    $avgResponse = ($counters.CounterSamples | Measure-Object CookedValue -Average).Average
    Write-Host "`nEWS Average Response Time (counter): $([math]::Round($avgResponse,0)) ms"0)) ms"
}

✓ Success Indicators

  • • EWS response < 2 seconds
  • • No Event ID 1008 warnings
  • • No throttling events
  • • Free/Busy working normally

⚠ Warning Signs

  • • EWS response 2-5 seconds
  • • Occasional slow events
  • • Some throttling occurring
  • • Intermittent Free/Busy issues

✗ Failure Indicators

  • • EWS response > 30 seconds
  • • Frequent Event ID 1008
  • • Heavy throttling
  • • Third-party apps failing

Prevention Strategies

EWS Best Practices

  • ✓
    Vet third-party apps

    Test EWS applications before production

  • ✓
    Use service accounts

    Apply specific throttling policies

  • ✓
    Monitor EWS usage

    Track request rates and response times

  • ✓
    Implement quotas

    Prevent excessively large mailboxes

EWS Monitoring Script

# Daily EWS health check
$server = $env:COMPUTERNAME
$alertThreshold = 5000  # ms

# Test EWS
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
$ewsUrl = "https://$server/EWS/Exchange.asmx"
try {
    $null = Invoke-WebRequest -Uri $ewsUrl -Method Head -UseDefaultCredentials -TimeoutSec 30
    $stopwatch.Stop()
    $responseTime = $stopwatch.ElapsedMilliseconds
} catch {
    $responseTime = 99999
}

$status = if ($responseTime -lt $alertThreshold) {"OK"} else {"ALERT"}

# Log
$log = "$(Get-Date -Format 'yyyy-MM-dd HH:mm'),$server,$responseTime,$status"-Format 'yyyy-MM-dd HH:mm'),$server,$responseTime,$status"
Add-Content "C:LogsEWS_Health.csv" $log

# Alert if needed
if ($responseTime -gt $alertThreshold) {
    Write-Warning "Slow EWS response: $responseTime ms"
}

When to Escalate

Escalate to Exchange Specialist When:

  • →EWS performance remains slow after optimization
  • →Cannot identify the cause of slow responses
  • →Free/Busy or availability service consistently failing
  • →Complex third-party integration issues
  • →EWS issues affecting hybrid connectivity

Need Expert Exchange EWS Help?

Our Exchange Server specialists can diagnose complex EWS performance issues, optimize throttling policies, and ensure your integrations work reliably.

Get EWS SupportCall: 1-800-555-1234

15 Minutes average response time for integration emergencies

Frequently Asked Questions

Exchange Web Services (EWS) is an API that allows applications to access mailbox data, calendar, contacts, and tasks programmatically. It is used by Outlook for Mac, mobile devices, third-party applications, and Microsoft services like Free/Busy lookups and Out of Office settings. Slow EWS performance impacts all these integrations.

Related Exchange Server Errors

Event ID 2080: EWS Connection Error

Read Fix Guide

Event ID 4999: High RPC Latency

Read Fix Guide

Event ID 5000: Worker Process High CPU Usage

Read Fix Guide
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