Learn how to encrypt an email message in Outlook using Microsoft 365 Message Encryption or S/MIME encryption. Choose the encryption option that suits your needs and follow the instructions for your Outlook version.

Learn how to locate your 25-character product key or digital license for Windows 10, Windows 11, Windows 8.1, or Windows 7. See where to find the product key on your device, box, or sticker, or how to contact the manufacturer if you've lost it.

Learn how to locate your BitLocker recovery key, a 48-digit number needed to unlock an encrypted drive in Windows. See where to find it attached to your Microsoft account, work or school account, printout, or USB flash drive.

Learn how to activate Microsoft 365 or a non-subscription version of Office with a product key, a Microsoft account, or a trial version. Troubleshoot activation errors and get help with guided support.

Learn how to redeem a Microsoft gift card, Xbox download code or token, Office product key, or Windows activation code to your Microsoft account. Find troubleshooting tips and contact support if you need help.

Learn how to use a digital ID to secure your email messages by adding a digital signature that verifies your identity and prevents tampering. Follow the steps to digitally sign a single message or all messages in Outlook.

Learn how to use a certificate to sign your macro project on Windows by using the Selfcert.exe tool. Find out how to add a time stamp to your signature, lock your macro project, and enable or disable macros in Microsoft 365 files.

Learn how to access your Hotmail or Outlook.com email account with your Microsoft Account password. Find troubleshooting tips, service status, and help options if you have problems signing in.

Learn how to access and manage a shared mailbox in Outlook for Microsoft 365, Outlook 2024, Outlook 2021, or Outlook on the web. A shared mailbox lets a group of users monitor and send email from a public alias, and also share a calendar and a contact list.

Learn how to use and manage the Contact Suggestions feature in the To, Cc, and Bcc fields in Outlook. Find out how to add, hide, or remove contacts from the list and how to turn off the Auto-Complete List.