Troubleshoot installing Office
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If you encountered a problem while installing Office on a PC, try restarting your computer and then attempting to install Office again. If that didn't help, use the uninstall troubleshooter to uninstall Office completely. After your uninstall is complete, try reinstalling Office.

Install updates on a Mac

For example, you can't install Office on computers running Windows XP or Windows Vista. If a Microsoft 365 application such as Word or Excel isn't working correctly, sometimes restarting it will fix the problem. When you're done, you might need to restart your computer.

Troubleshooter didn't help? Select from below:

To troubleshoot Mac activation issues, see the "Activation" section in What to try if you can't install or activate Office for Mac. Office up-to-date ensures that you have the latest security updates and fixes. If your admin has given you permission to install updates, see Install Office updates. For example, you can't install Office on computers running Windows Vista or Windows XP, or on devices that aren't running a supported Windows or Mac operating system. However, you may still be able to use Office Online in your computer's browser. In most cases you can do basic editing on most of these devices, however if you have a qualifying Office 365 subscription, you get access to the apps' extra features.

I recently switched Office 365 plans and now get messages I can't use Office

When you're done, you might need to restart your computer.As the Office 365 for business admin, you're responsible for Managing user software in Office 365.If Office is taking a long time to install you may be on a slow connection or you another install or update may be happening in the background.To troubleshoot Mac activation issues, see the "Activation" section in What to try if you can't install or activate Office for Mac.Come with me as I write this article in real time as I try to resolve the issue.See the bottom of the Office for business column for a list of plans that don't include the Office desktop client.In addition, with Office for business plans only admins responsible for managing Microsoft 365 in their organization can do certain tasks.

To install or check for updates on your Mac, see Check for Office for Mac updates automatically. If you're an Office 365 user, do the following to deactivate an installation. If Office is taking a long time to install you may be on a slow connection or you another install or update may be happening in the background. See Office is taking long to install or Office Step-by-step guide for Outlook stuck on profile hangs at 90% for possible solutions.

Install Office apps and set up email on a mobile device (iOS, Android, or Windows phone or tablet)

If you're an admin and you aren't sure what plan you have, follow the steps in What Office 365 for business subscription do I have? For a comparison of plans, see compare small business plans or compare enterprise plans. Please let us know if you found any of these solutions helpful by leaving us a comment below.

You don't know what Office 365 product or license you have

You can activate Office on up to five computers per user. If a user needs to install Office on a sixth computer, you have to deactivate an installation. Deactivation doesn't remove Office from the computer, but you can't use Office on that computer until you activate it. See Deactivate Office 365 if you see a "limit reached" error.

How do I repair Microsoft Office 365 installation?

If you're still having issues, admins can Contact Office 365 for business support. If you need more licenses, see Buy licenses for your Office 365 for business subscription. To remove a license from your subscription, see Remove licenses from your Office 365 for business subscription. See Uninstall Office for Mac for instructions on uninstalling the Office apps.