Learn how to locate your Microsoft Office product key, which allows you to activate and use your Office products without requiring a Microsoft account.

Learn how to play different type of CDs and DVDs in Windows Media Player.

Here are some answers to the frequently asked questions about the OneDrive desktop app for Windows.

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.

Send large files by using file sharing, cloud services, or other solutions for working around file size limits in Outlook.

Add or remove items from an existing drop-down list (also called a drop-down menu or drop-down box).

If Office activation fails, you'll see Unlicensed Product or Non-commercial use / Unlicensed Product in the title bar of your Office apps, and most features of Office are disabled. To restore all features of Office, you'll need to fix the problem that's causing activation to fail.

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

You can block messages from specific email addresses or domains from reaching your inbox. When you add an email address or domain to your blocked senders list, Outlook automatically moves messages from that sender to the Junk Email folder.

Here are some solutions to common problems with the new Microsoft Edge . If Microsoft Edge keeps crashing. If you can't open Microsoft Edge, or if it opens briefly and then closes, or if you’re unable to open specific webpages, here are some things you can try.