Google Workspace to Office 365 Migration, Managed Without the Downtime

Google Workspace to Microsoft 365 migration, done properly

Moving from Google Workspace to Office 365 involves a lot more than switching where email arrives. Gmail messages need migrating into Exchange Online mailboxes, Google Drive files and shared drives need moving into OneDrive and SharePoint, Google Calendar events need transferring across so meetings and invites survive the switch, and Google Contacts need carrying over so nobody loses a client's number on cutover day. Done properly, staff should barely notice the move beyond a different-looking inbox and a short adjustment period getting used to Outlook and Teams instead of Gmail and Meet.

Most businesses make this move for a practical reason rather than a strong preference for one platform over the other. A common driver is a Windows-based device fleet where desktop Office apps, file compatibility with clients and suppliers, and deeper Teams integration simply fit better day to day than Google's browser-first approach. Another is a merger or acquisition where the acquiring business standardises on Microsoft 365 and needs the acquired company's Google Workspace environment folded in cleanly. Either way, the underlying goal is the same: move everything across accurately, with as little disruption as possible.

The file migration piece is usually where the real complexity sits, more so than mail. Google Drive's shared drive structure, permission model and file-sharing links don't map one-to-one onto SharePoint and OneDrive, so a naive "just copy everything across" approach tends to break sharing permissions and leave staff unable to access files they previously had open access to. We map your shared drive structure to SharePoint sites deliberately, preserving folder structure and access permissions rather than dumping everything into one flat OneDrive folder and leaving your team to sort it out afterwards.

Retraining is the other part that's easy to underestimate. Staff who've used Gmail and Google Docs for years will find some things instantly familiar in Outlook and Word, and other things genuinely different — shared mailbox handling, calendar sharing conventions and how Teams handles chat versus channels all work differently to Google's equivalents. A short briefing before cutover and clear points of contact for the first week afterwards save far more support tickets than they cost in time.

Timing the migration around your business calendar matters more than most businesses initially plan for. Running a mail and file migration during your busiest trading period, a major client deadline, or an end-of-year reporting crunch multiplies the disruption of even a well-planned cutover. We work with you to identify a genuinely quiet window, and where a business runs shift patterns or has staff in different time zones, we schedule the cutover itself outside working hours so the transition is complete before most of the team logs back in.

Google Workspace vs Microsoft 365 — what actually changes

Both platforms cover the same basics — email, file storage, calendars and video calling — but the underlying philosophy differs. Google Workspace is browser-first, with Docs, Sheets and Drive built around real-time collaborative editing in a browser tab. Microsoft 365 leans on the desktop Office apps as the primary experience, with Teams as the collaboration hub, which tends to suit businesses with Windows-based device fleets, established Office-based document workflows, or clients and suppliers who exchange Word and Excel files as standard. Neither platform is objectively better; the right choice depends on how your business, your device fleet and the organisations you work with already operate. For businesses migrating specifically because of a merger, an acquisition, or growing friction with document compatibility, Microsoft 365 is usually the practical destination rather than a preference decided in the abstract. Whichever direction a business is moving, the decision is rarely reversed quickly once made, given the retraining and re-migration involved — which is exactly why it's worth getting the assessment and planning stage right before committing to a cutover date.