On the Email tab, choose your account (profile), and then choose Repair. Note: The Repair option isn't available if you're using Outlook 2016 to connect to an Exchange account. Follow the prompts in the wizard, and when you’re done, restart Outlook.

Select the Data Files tab. All Outlook Data Files (.pst) and Offline Data Files (.ost) are listed along with the name of the account the files are associated with. 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.

The Microsoft Support and Recovery Assistant can help you automatically diagnose and fix a range of Outlook problems. You will need to download the application to your local computer, sign in with your home, work, or school account and select the issue you want help with.

The Inbox Repair Tool can resolve issues by scanning your Outlook data files and repairing errors. To use the Inbox Repair Tool, exit Outlook, go to Repair Outlook Data Files (.pst and .ost) and follow the relevant steps.

This article describes how to troubleshoot Microsoft Outlook when it's used together with Microsoft 365 and: Outlook stops responding (hangs). Outlook crashes even though you aren't actively using it.

Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. These files occasionally might become corrupted. You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. Exit Outlook to use the Inbox Repair Tool.

A .pst file is a personal-folders file that stores your email messages, contacts, notes, calendar items, and other data. If the .pst file is corrupted, you may not be able to send or receive email messages in Outlook. To resolve this issue, repair your Outlook personal folder file (.pst).

For issues that are not covered on this page, we have multiple tools to help you automatically diagnose and fix a range of Outlook problems. Check out this article: Resolve Outlook for Windows issues with automated troubleshooting tools. Jump to each section on this page for specific Outlook issue:

Import your messages or account from Outlook Express to Outlook. Outlook for Microsoft 365 Outlook 2021 Outlook 2019 Outlook 2016. Microsoft Outlook Express is a free, basic email program. You can import email messages and account information from Outlook Express into Microsoft Outlook.