What happens to Microsoft when you switch Macs

Microsoft Office does not automatically transfer to a new Mac. When you set up a new computer, Office stays on your old one unless you manually move it or reinstall it. The process depends on how you own Office — whether you have a subscription like Microsoft 365, a one-time purchase like Office 2019, or a version that came with your Mac.

The good news is that moving Office is straightforward once you know which type you have. You sign in with the same Microsoft account, reinstall on the new Mac, and your documents, settings, and license all come with you. The tricky part is that you cannot simply copy the Office folder from one Mac to another — it will not work that way.

Key Takeaways

  • Microsoft Office requires reinstallation on a new Mac; it does not transfer automatically even if you migrate other files.
  • Microsoft 365 subscriptions move with your account, so you sign in on the new Mac and reinstall from the Microsoft website.
  • One-time Office purchases like Office 2019 are tied to your Mac's hardware, so you may need to deactivate the old Mac before installing on the new one.
  • Your documents stored in OneDrive or on your Mac's hard drive stay accessible once you sign into your Microsoft account on the new computer.
  • You should deactivate Office on your old Mac before you stop using it, especially if you own a one-time purchase version.

How Microsoft 365 subscriptions move to your new Mac

If you pay for Microsoft 365 (the subscription that renews monthly or yearly), your Office license is tied to your Microsoft account, not to your Mac. This means you can sign in on a new Mac and reinstall Office without buying it again.

To move Microsoft 365 to your new Mac, go to the Microsoft Office website, sign in with the same account you used on your old Mac, and download Office. The installation will recognize your subscription and activate automatically. You do not need a product key or any special steps — just your account login.

After you install on the new Mac, you can deactivate Office on your old Mac by going to Account settings in any Office app and choosing to sign out. This is not required, but it is good practice if you are selling or giving away the old computer.

One-time Office purchases like Office 2019 or Office 2016

If you bought Office once (not a subscription), your license is tied to that specific Mac. You cannot simply move it to a new computer — you have to deactivate it on the old one first, then install it on the new one.

To move a one-time purchase, open any Office app on your old Mac, go to Account, and look for a Deactivate or Sign Out option. This frees up your license. Then on your new Mac, download Office from the Microsoft website (or use your installation disc if you have one), install it, and sign in with the same Microsoft account. You will be asked for your product key — use the same one you used before.

If you cannot deactivate on the old Mac because it is broken or lost, contact Microsoft Support. They can manually deactivate the license so you can use it on your new computer, but you will need to verify that you own the license.

What about your documents and files

Your Word documents, Excel spreadsheets, and PowerPoint files do not depend on Office being installed — they are just files. If you have them stored in OneDrive, they will appear on your new Mac as soon as you sign into OneDrive with the same account. If they are on your old Mac's hard drive, you can copy them to an external drive or use Migration Assistant to move them to the new Mac.

Your Office settings, like custom toolbars or recent files lists, do not transfer automatically. Once you reinstall Office on the new Mac and sign in, you may need to reconfigure some preferences. This usually takes just a few minutes.

Using Migration Assistant to move everything at once

If you want to move your entire old Mac to a new one, including Office, you can use Apple's Migration Assistant. This tool copies your files, settings, and installed programs from the old Mac to the new one. Office will transfer, but it will still need to be activated on the new Mac.

After Migration Assistant finishes, open any Office app on your new Mac. If you have a Microsoft 365 subscription, sign in and it will activate. If you have a one-time purchase, you may see a message asking you to activate — sign in with your Microsoft account and follow the prompts. In some cases, you may need to deactivate on the old Mac first, even though Migration Assistant moved the files.

Migration Assistant is the easiest way to move everything, but it requires both Macs to be nearby and connected to the same network. If that is not possible, you can manually copy your documents and reinstall Office instead.

Troubleshooting Office after the move

If Office says your license is not valid after you move to a new Mac, the most common reason is that you did not deactivate it on the old Mac first (if you have a one-time purchase). Sign out of your account in Office, restart the app, and sign back in. If that does not work, restart your Mac.

If you see a message that says you have reached the maximum number of installs, you have Office running on too many Macs at once. Go to your Microsoft account online, find the Devices section, and remove the old Mac from the list. Then try to activate on the new Mac again.

If you cannot remember your Microsoft account password, go to account.microsoft.com and use the password reset option. You will need access to the email address or phone number associated with your account.

Frequently Asked Questions

Can I use the same Microsoft 365 subscription on two Macs at the same time?

Yes. Microsoft 365 allows you to install Office on multiple devices and sign in on all of them. However, you can only use Office actively on one Mac at a time per subscription. If you need Office on two Macs simultaneously, you need two separate subscriptions.

What if I lost my old Mac and cannot deactivate Office?

Contact Microsoft Support with proof that you own the license (your receipt or account information). They can deactivate the old Mac remotely so you can install Office on your new one. This process usually takes a few hours to a day.

Do I need to buy Office again if I get a new Mac?

No, if you have a Microsoft 365 subscription or a one-time purchase. Both move with your account or can be reactivated on the new Mac. You only need to buy Office again if your license has expired or if you are switching to a completely different account.

Will my Office templates and add-ins transfer to the new Mac?

Custom templates and add-ins do not transfer automatically. You can copy template files manually from your old Mac to the new one, but add-ins usually need to be reinstalled from the Microsoft Store or their original source.

Can I move Office from a Mac to a Windows PC?

No. Office licenses are platform-specific — a Mac license works only on Mac, and a Windows license works only on Windows. If you need Office on both, you need separate licenses for each platform, or a Microsoft 365 subscription that includes both versions.