Migrate mailboxes, calendars, and contacts between Google Workspace, Microsoft 365, Exchange, and on-prem — with zero mail loss and minimal downtime.
Talk to an email migration specialistEmail migration is high-stakes because every user notices immediately if something goes wrong. Lose an email, break a calendar invite, or mess up folder structures and you have a building full of angry employees on Monday morning. Most email migrations fail because of poor planning around DNS cutovers, mailbox size limits, and shared mailbox handling.
CB4UHost migrates email between Google Workspace, Microsoft 365, Exchange Server, and on-prem systems. We use vendor migration tools (Google Workspace Migration, Microsoft FastTrack) plus third-party tools (BitTitan, Quest) when the vendor tools aren't enough.
We handle mailboxes, calendars, contacts, shared mailboxes, distribution lists, and archive data. We plan the DNS cutover (MX records, SPF/DKIM/DMARC) to minimize mail delivery delays, and we monitor for 7 days post-migration to catch any stragglers.
Every migration ends with user communication templates, admin runbooks, and a 7-day monitoring window.
We inventory mailboxes, shared mailboxes, distribution lists, and archive data.
Detailed plan with DNS cutover timing, user communication, and rollback.
We pre-stage mailbox data (often 1-2 weeks before cutover) so the final delta sync is small.
MX record, SPF/DKIM/DMARC cutover with 7-day monitoring for delayed mail.
Email templates, FAQ, and end-user support runbook for the migration week.
7-day monitoring window plus admin and user runbooks.
We inventory mailboxes and plan the migration strategy.
We bulk-migrate mailbox data 1-2 weeks before cutover.
We sync the delta (new mail since pre-stage) and cut over DNS.
We monitor for 7 days to catch delayed mail or sync issues.
We hand over admin runbooks and user documentation.
Interactive tools related to this service.
Typically 30 minutes to 2 hours during the DNS cutover window (usually scheduled overnight or on a weekend). Users can still send/receive on the old system until cutover, then on the new system after. Pre-staging means the actual cutover is small.
Yes. We migrate Exchange Online Archives, on-prem archives, and PST files to the new system. PST ingestion can be slow for large archives — we'll estimate during planning.
We migrate all of them — shared mailboxes, room/equipment mailboxes, distribution lists, mail-enabled security groups, and contacts. We map them 1:1 unless you want to restructure.
We keep the old MX records active for 48-72 hours after cutover and configure mail forwarding at the old provider. Any mail that hits the old provider during DNS propagation gets forwarded to the new provider — zero mail loss.
Migrate VMs, storage, and networking from one provider to another — with zero-drama cutover, rollback, and post-migration optimization.
Move applications between clouds, providers, or architectures — with refactoring options from lift-and-shift to full replatforming.
Tell us about your project. We'll come back with a scoped proposal and a fixed-fee quote.
Talk to an email migration specialist