MDaemon to Office 365 Migration
MDaemon Email Server → Microsoft 365. The classic SMB mail server, retired properly: IMAP mail sync, WorldClient calendar/contact exports, alias and list re-creation. From $15/user.
BitTitan Certified · Zero Data Loss Record · DNS Handled
Every mailbox. Every folder. Verified.
What staying actually costs.
MDaemon servers run for decades — and their admins retire with them. Migrating while the person who knows the config is still reachable is worth real money.
MDaemon calendars/contacts (WorldClient/ComAgent data) need MDaemon-aware export — plain IMAP moves mail only. We handle both lanes.
A self-hosted SMTP server in 2026 is an attack surface with a birthday. M365 puts Microsoft’s security team between you and port 25.
Off-hours MX flip after delta sync — typical MDaemon shops complete within a week.
Everything handled. Nothing assumed.
Server-side IMAP mail sync
All mailboxes and folder structures sync in the background over IMAP; users keep working on MDaemon until cutover night.
WorldClient calendar/contact export
MDaemon’s groupware data exports via MDaemon-aware paths (ICS/CSV/MIME) and imports into Exchange Online, verified per user.
Aliases, lists & gateways
MDaemon aliases, mailing lists, and domain gateway configs inventoried and recreated as Microsoft 365 equivalents.
Content-filter mapping
MDaemon content filter and SecurityPlus rules catalogued and mapped to EOP/Defender policies so mail behavior carries over.
DNS + deliverability reset
MX, SPF, DKIM, DMARC re-published for Microsoft 365 — retiring the static-IP reputation you’ve been babysitting.
Server decommission
After verification: SMTP listener off, gateway rules removed, box retired with a documented runbook.
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 MDaemon 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 MDaemon-specific realities.
Generic migration guides skip these. They are the operational details that decide whether your cutover weekend is boring — which is the goal.
Plain IMAP moves MDaemon mail only — calendars/contacts (WorldClient data) need the MDaemon-aware export lane we run in parallel
MDaemon aliases, lists, and gateway domains hide years of config — we inventory from the config files, not from memory
Content-filter rules must be mapped to EOP/Defender before cutover, or spam behavior changes on day one and users notice immediately
Frequently Asked Questions
Do MDaemon calendars and contacts migrate to Office 365?+
Which MDaemon versions do you support?+
How long does an MDaemon to Office 365 migration take?+
What is the downtime during a MDaemon to Microsoft 365 migration?+
Is there any risk of data loss?+
What does the migration include for $15/user?+
MDaemon earned retirement. Grant it.
$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
Migrations Hub
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Email, OneDrive, Teams, SharePoint — all sources.
Learn More →IMAP → M365
Any IMAP server — the generalist migration path.
Learn More →Migration Calculator
Instant estimate for your user count and data.
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