Reasons Why You Can’t Start Outlook

Several issues could cause Outlook to open incorrectly or not at all. Some common culprits include:

Problematic add-ins or extensions.Damaged files.A corrupted profile.Navigation pane issues.

There are other issues, too, that can contribute. Maybe you’ve added a new program to your computer that doesn’t get along with Outlook, for example, or your system has a virus. Regardless of the specific cause, there are several key troubleshooting fixes to try that might help.

How To Fix Outlook Not Opening in Windows

If you use Outlook on a Windows computer and Outlook doesn’t open or opens with problems, try these troubleshooting steps in the order presented here, from simple to more complicated.

How To Fix Outlook Not Opening in Mac

The following troubleshooting techniques apply to Outlook 2016 for Mac and Outlook 2011 for Mac.