Learn the difference between IMAP and POP, and when to use each one.

Outlook Express could not be started. It may not be installed correctly. Make sure that your disk is not full or that you are not out of memory.

If your antivirus software includes an email-scanning feature, you may have to perform additional configuration tasks to use Outlook or Outlook Express together with the antivirus software.

View and reply to an encrypted message without Microsoft 365 using Outlook for PC. If you're not using Outlook with Microsoft 365, your encrypted message will contain a link in the message body.

If you're prompted to verify your account when you try to send an email message from Outlook.com, it is because we are trying to protect your account.

For information about the differences between Microsoft Outlook Express and Microsoft Outlook e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base: 257824 Differences Between Outlook and Outlook Express. Summary

When you switch between identities, Outlook Express may stop responding (hang). During subsequent attempts to restart Outlook Express, Outlook Express hangs, resulting in a busy cursor (an hourglass).

Learn how to use Outlook mobile for iOS and Android.

If you're trying to add your Outlook.com account to Outlook or another mail app, you might need the POP, IMAP, or SMTP settings. You can find them below or by viewing them in your Outlook.com settings.. Outlook and Outlook.com may be able to detect your account's mailbox settings automatically, but for other non-Microsoft accounts, you may need to contact your email provider for their settings.

Learn to add email accounts such as Gmail and Yahoo! Mail to your Outlook.com app so you can view all of your mail from one location.