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.

If you cannot open your Outlook data file or suspect that the file is damaged, use the Inbox Repair tool (scanpst.exe) to repair errors in the file.

To help improve your privacy in Excel, a password adds protection to worksheets to help prevent others from changing, moving, or deleting important data.

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

Learn how to set up and use the Outlook Mobile app for multi-factor authentication.

Microsoft Support offers assistance for Microsoft products, including how-to articles, videos, and training for various software and devices.

Choose how you want emails displayed in the message list, such as whether you want emails displayed as individual messages or as conversations.

Learn how to record or create macros and execute them using buttons or keyboard shortcuts in Microsoft Office applications.

Learn how to manage your Microsoft devices. Add, remove, register, or rename a device on your Microsoft account.

Microsoft 365 provides powerful tools to help organize you and your family's lives. Empower you and your family through the Microsoft 365 Family subscription and learn how to create family calendars, share notes with a family notebook on OneDrive, and connect with your family on Microsoft Teams.