Learn about the UNIQUE function, which returns a list of unique values in a list or range. UNIQUE is in a class of functions called dynamic arrays.

Find answers to frequently asked questions about Office 2021 and Office LTSC for Windows and Mac on the official support page.

Learn how to unlock your Microsoft account and resolve 'account has been locked' error message.

The files you store on a SharePoint site are usually available to everyone with permissions to the site, but you may want to share specific files or folders with people who don't otherwise have access to the site.

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Linking Microsoft personal accounts. It’s not possible to link, merge or combine Microsoft personal accounts, and you can't you transfer such things as your game progress or gamertag, account purchases and balance from one account to another, but accounts can be used side by side.

Learn how the service process for Microsoft Surface works and how to request service online if your Surface needs repair.

You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors.

Set up the Microsoft Authenticator app from the Security info page. Depending on your organization’s settings, you might be able to use an authentication app as one of your security info methods.

Get troubleshooting tips if you run into problems downloading, installing, or updating Microsoft Edge.