Using Google Workspace and Microsoft 365 Together

In an ideal world a business picks one productivity suite and stays there. In the real world, mergers, acquired teams, and client requirements sometimes leave you running both Google Workspace and Microsoft 365. It can work — as long as it is set up deliberately.

First, decide who owns what

The most important step is not technical. Before touching settings, decide which system is the source of truth for each thing: which one holds your primary email, where shared files live, which calendar is authoritative. Running both without that clarity is where the confusion — and the broken workflows — start.

Email is the part to be careful with

Email is the piece most likely to break. A domain’s mail settings can really only point one place at a time, so you cannot casually have both systems delivering mail for the same addresses. Getting this right usually means one system handles the mail while the other is used for its apps, or a careful arrangement of subdomains. This is the part worth planning rather than experimenting with on your live domain.

Files and collaboration

For files, the cleanest approach is to pick one home and stick to it, rather than scattering documents across both. If teams genuinely need to work in different tools, agree on where the master copy lives so “which version is current?” never becomes a daily question.

Logins and accounts

Two systems means two sets of accounts, which means two places to manage access and secure with two-factor authentication. Keep a clear record of who has what, and make sure leaving staff are removed from both — a forgotten account in the system you use less often is an easy thing to miss.

Or simplify, if you can

Running both adds cost and complexity, so it is always worth asking whether you truly need to. Sometimes consolidating onto one suite is the better long-term move. If you are not sure, or you need the two to coexist cleanly, this is exactly the kind of setup worth having planned properly. We help businesses run — or untangle — Google Workspace and Microsoft 365 without the email disasters.