Troubleshoot Outlook for Windows issues

If you are having problems with Outlook, there are a few things we can help with to get you back to sending and receiving your email.

Important: Steps may be different between new and classic Outlook for Windows. To determine which version of Outlook you're using, look for File on the ribbon. If there's no File option, follow the steps under the New Outlook tab. If the File option appears, select the tab for Classic Outlook.

For information on emerging or known Outlook issues, go to Fixes or workarounds for recent issues in Outlook for PC.

Restart new Outlook

1. Right-click Start and select Task Manager.
2. Select Microsoft Outlook, then End task.
3. Check to make sure that new Outlook is closed, then close Task Manager.
4. After new Outlook closes, reopen the app as you normally would.

Uninstall and reinstall the new Outlook for Windows

To uninstall new Outlook:

1. From the Start menu, select new Outlook for Windows.
2. Select the arrow to expand the list option in Start.
3. Select Uninstall to begin the uninstall process.

To reinstall new Outlook:

1. Open classic Outlook for Windows.
2. In the top corner, you'll see a toggle to Try the new Outlook

If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook.

You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below.

Did that work? Great. If not, you can contact support.

You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally.

1. In Windows 10, click Start.
2. Type Outlook /safe, in the Search programs and files and then click OK.
3. Close and re-open Outlook.
4. If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.
   1. Open the File menu, click Options, then click Add-ins.
   2. Select COM Add-ins and click Go.
   3. Clear all the check boxes in the list to disable the Add-ins and click OK.
   4. Restart Outlook.
   5. If the issue does not occur, go back to the COM Add-ins screen and enable them one at a time until the error occurs. (Be sure to close and restart Outlook after each Add-in is enabled.)

   Did that work? Great. If not, you can contact support.

   Is Outlook frozen?

   If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have frozen. There are three steps you can take to try to get Outlook working again.

   Check for other Outlook processes running

   Occasionally, Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, wait a short time (usually two or three minutes) to see if Outlook starts working again.

   Did that work? Great. If not, you can contact support.

   Do you see the message "This set of folders could not be opened"?

   If you can't open a particular set of folders, you can try to repair your personal folders file or create a new profile.

   Create a new profile

   Try following the steps outlined here to create a new profile:

   Did that work? Great. If not, you can contact support.

   Repair your .pst file

   Try following the steps outlined here to repair your .pst file:

   Did that work? Great. If not, you can contact support.