Kerio to Office 365 Migration
Kerio Connect → Microsoft 365 — mail, calendars, contacts, public folders. GFI’s slow release cadence has Kerio shops migrating in waves. The path is well-worn: server-side sync, resource re-creation, weekend cutover. From $15/user.
BitTitan Certified · Zero Data Loss Record · DNS Handled
Every mailbox. Every folder. Verified.
What staying actually costs.
Under GFI, Kerio Connect releases slowed to a crawl. Modern auth, mobile management, and security features froze while the threat landscape didn’t.
Kerio’s message store means one slow disk bottlenecks the whole export. We sync off-hours at paced concurrency so production survives its own migration.
Old Kerio versions with weak TLS can’t talk to modern endpoints securely — our staging relay bridges them without plaintext mail in transit.
A typical 30-user Kerio server completes within a week — background sync, then a 2-4 hour weekend MX flip.
Everything handled. Nothing assumed.
Server-side mail sync
Mail and folder structure migrate over IMAP with delta passes before cutover, paced so the Kerio store’s disk keeps up.
Calendars & contacts
Kerio’s store keeps calendar/contact data server-accessible — exported server-side and imported into Exchange Online, recurring events verified.
Public folder mapping
Kerio public folders map to Microsoft 365 shared mailboxes or SharePoint depending on how each is actually used — decided per-folder with you.
Rooms & resources
Kerio resources (rooms, equipment) recreated as Microsoft 365 resource mailboxes with booking policies configured.
Legacy TLS staging relay
Old Kerio versions with outdated TLS transfer through a secured staging relay — no plaintext hop anywhere in the path.
Lists & aliases
Distribution lists and aliases inventoried from Kerio admin and recreated in Microsoft 365 before cutover.
Assess. Plan. Migrate. Cutover.
Assess
1-2 days · Source audit, mailbox inventory, domain list. Fixed per-user quote in 24-48 hours.
Plan
1-2 days · Microsoft 365 tenant provisioned, domains verified, MFA + security baseline deployed.
Migrate
Background · Server-side pre-stage sync runs invisibly. Users keep working on the old system until cutover.
Cutover
2-4 hrs off-hours · MX/SPF/DKIM flip, final delta sync, Autodiscover repoint. 30 days hypercare.
The engineers on your project.
No outsourced ticket triage. The same three engineers handle source assessment, tenant provisioning, cutover night, and post-migration support on every Kerio Connect engagement.
Sreenivasa Reddy
Founder & Principal Migration Engineer
MCSE Messaging · 25 yrs · 500+ migrations led
Owns the discovery call and migration architecture: source assessment, licensing right-size, and the compliance/security mapping that decides which M365 SKU mix you actually need.
Roshan Pujari
Senior Migration Engineer · Source Systems Lead
Microsoft Certified · M365 Administrator
Runs source-side assessment and extraction: credentials, throttling strategy, batch design, and the pre-stage sync that makes cutover weekends boring.
Bhargav
Senior Migration Engineer · Mail Flow + Cutover
Microsoft Certified · Exchange + M365 Messaging
MX/SPF/DKIM/DMARC cutover and Autodiscover repoint. Owns the 2-4 hour cutover window plus post-cutover Outlook profile and mobile device resync.
The Kerio Connect-specific realities.
Generic migration guides skip these. They are the operational details that decide whether your cutover weekend is boring — which is the goal.
Kerio’s single-instance store means one slow disk bottlenecks the export — off-hours pacing keeps production alive during sync
Kerio distribution lists and resources are recreated, not migrated — we inventory them first so nothing is discovered missing later
Old Kerio versions with weak TLS need a secured staging relay for transfer, which we provide as standard
Frequently Asked Questions
Can you migrate from an old Kerio Connect version?+
Do Kerio calendars migrate with recurring events intact?+
What does a Kerio to Office 365 migration cost and how long does it take?+
What is the downtime during a Kerio Connect to Microsoft 365 migration?+
Is there any risk of data loss?+
What does the migration include for $15/user?+
Kerio’s roadmap stalled. Yours shouldn’t.
$15/user flat. Pre-staged sync, off-hours cutover, DNS handled, 30-day hypercare. Zero data loss record across 1.4M users.
Microsoft Solutions Partner · BitTitan certified · Fixed-fee · 500+ migrations
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