AppRiver to Office 365 Migration
AppRiver (Zix/OpenText) hosted Exchange → direct Microsoft 365 tenant. Full-fidelity EWS migration with the reseller-exit steps handled: admin access coordination, DNS re-pointing, spam-filter policy replication. From $15/user.
BitTitan Certified · Zero Data Loss Record · DNS Handled
Every mailbox. Every folder. Verified.
What staying actually costs.
AppRiver → Zix → OpenText in a few years. Every acquisition moved your mail further from the vendor’s core business. Direct Microsoft removes the middleman entirely.
Resold M365/hosted Exchange through AppRiver carries markup plus feature limits — no direct BAA, curated SKU list, support through their queue.
Years of AppRiver SecureTide rules must be replicated as Defender/EOP policies — or day-one mail flow behaves differently. We catalogue and rebuild them.
Standard off-hours MX + Autodiscover flip: 2-4 hours, devices re-sync automatically.
Everything handled. Nothing assumed.
EWS full-fidelity transfer
AppRiver hosted Exchange migrates mail, calendars, contacts, and tasks server-side in one pass with folder permissions intact.
Resold-M365 tenant moves
On AppRiver-resold Microsoft 365? That’s a tenant-to-tenant migration into your own direct tenant — we run those weekly.
SecureTide → EOP/Defender mapping
Spam/filter policies catalogued from AppRiver and rebuilt as Exchange Online Protection and Defender policies before cutover.
Pre-stage + delta sync
Background sync for days or weeks, nightly deltas, cutover carries only the final hours of mail.
DNS + Autodiscover cutover
MX, SPF, DKIM, DMARC re-published wherever your DNS lives; Autodiscover repointed the same night.
Cancellation sequencing
Verification before termination — reseller tenants deprovision on their schedule, not yours.
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 AppRiver 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 AppRiver-specific realities.
Generic migration guides skip these. They are the operational details that decide whether your cutover weekend is boring — which is the goal.
AppRiver-resold M365 can’t be "transferred" to direct — it’s a tenant-to-tenant migration, and we scope it as one from day zero
SecureTide filter rules accumulated over years must be catalogued and rebuilt as EOP/Defender policies, or mail flow surprises users on day one
Admin credential and export access can take days through the OpenText support queue — we request it first, before any timeline is promised
Frequently Asked Questions
We buy Microsoft 365 through AppRiver — can you move us to a direct tenant?+
What happens to our AppRiver spam filtering?+
How long does an AppRiver to Office 365 migration take?+
What is the downtime during a AppRiver to Microsoft 365 migration?+
Is there any risk of data loss?+
What does the migration include for $15/user?+
Three acquisitions later — go direct.
$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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