Every migration has traps
Switching email platforms looks simple until the morning after: recurring meetings missing, shared mailboxes nobody can open, and messages bouncing because a DNS record was missed. Almost all of it is avoidable with planning. We copy everything before the switch, change DNS out of hours, and check every mailbox before people start work.
What we migrate
Google Workspace to Microsoft 365, and the other way. Mail, calendars, contacts, and Drive or OneDrive files where they are part of the move.
Exchange servers to the cloud. On-site or hosted Exchange moved to Microsoft 365 or Google Workspace.
Older mail hosts. IMAP mailboxes from hosting providers or cPanel accounts moved to a proper business platform.
Tenant to tenant. Two Microsoft 365 or Google Workspace accounts combined after an acquisition, or one split out after a sale. Our post-acquisition data consolidation page covers the wider version of that work.
Archives. PST files, Google Vault exports and old journaling archives brought into the new platform or a searchable archive.
How it works
Week 1: Audit. We list every mailbox, shared mailbox, alias, group, forwarding rule and domain, plus anything that sends mail on your behalf, such as your CRM, billing system or website forms. These are the things that get missed.
Week 2: Prepare. Accounts, groups and aliases are created on the new platform. We use migration tools suited to the platforms involved, such as BitTitan MigrationWiz or Google and Microsoft's own tools, and start copying mail and calendars in the background.
Week 3: Switch. On the agreed evening we take a final copy and switch MX records, so new mail goes to the new platform. SPF, DKIM and DMARC are updated and tested on every domain the same night.
The next morning. People sign in to the new platform on their Macs and phones, set up in advance through device management where possible. We are on hand that day to fix anything that does not look right.
Afterwards. A delta copy picks up any late messages from the old system, which stays available read-only until you are ready to close it.
Why Stabilise
We support both Google Workspace and Microsoft 365 day to day, so we can tell you whether a move is worth it before you commit, and we look after the result afterwards. Email security comes with it: our email security audit checks the records that decide whether your mail is trusted.
Frequently Asked Questions
Will we lose any email? No. Everything is copied before the switch, a final copy runs on the night, and a delta copy afterwards picks up stragglers. We check mailbox sizes match before we close the old system.
Will email stop working during the switch? The switch happens out of hours. DNS changes can take a few hours to reach everyone, and during that time mail arrives at one platform or the other; the delta copy brings across anything that landed in the old one.
Do recurring meetings survive? Most do. Some complex recurring series do not translate cleanly between Google and Microsoft, so we list them in advance and ask organisers to recreate the few that need it.
What about our shared drives? If files are part of the move, we plan them as a cloud storage migration alongside the email, so permissions are mapped properly.
