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Change from a 32-bit version to a 64-bit version or vice versa. Activate Windows. Fix Bluetooth problems in Windows. Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

Applies To: Office 2021, Office 2021 for Mac, Office 2019, Office 2019 for Mac, Microsoft 365 for home, Office for business, Office 365 Small Business, Microsoft 365 admin, Office 365 operated by 21Vianet, Office 365 operated by 21Vianet - Admin, Microsoft 365 for Mac, Office 365 Germany - Enterprise, Office 365 Germany - Enterprise admin

Locate your product key for Windows 10 or Windows 11. Depending on how you got your copy of Windows 10 or Windows 11, you'll need either a 25-character product key or a digital license to activate it.

Applies To: Microsoft account dashboard

SharePoint is a browser-based app that you connect to through your web browser, like so: Go to office.com, and sign in to your work or school account. In the upper left corner of the window, select the app launcher > All apps > SharePoint.

Applies To: SharePoint in Microsoft 365

Install Microsoft 365 2019 or 2016 on a PC. Remember a one-time purchase version of Microsoft 365 is licensed for one install only. Depending on your browser, select Open file (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

Applies To: Office 2019, Office 2016, Office 2016 for Mac, Office 2013

Find operating system info in Windows 11. To find out which version of Windows your device is running, press the Windows logo key + R, type winver in the Open box, and then select OK. Here’s how to learn more: Select Start > Settings > System > About . Open About settings.

Find your Office product key. Many tasks for Office products don't require a product key because your Microsoft account takes care of them instead.

If you can't find a file on your computer or you accidently modified or deleted a file, you can restore it from a backup (if you're using Windows backup) or you can try to restore it from a previous version.

You can view and clear your Microsoft Edge browsing history stored on a single device, across all synced devices, and in the cloud. You may choose to clear your browsing history at any time.

Decide which documents to recover from an unexpected close, delete recovered files you don't want, or close recovered files to review later.

Applies To: Word for Microsoft 365, Word for Microsoft 365 for Mac, Word 2021, Word 2021 for Mac, Word 2019, Word 2019 for Mac, Word 2016

Get help and support, whether you're shopping now or need help with a past purchase. Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.