If a troubleshooter is available for your issue, select Start to run that troubleshooter. Not something you want to take on lightly, but sometimes you have to. Be aware that you may need your product key if you received one. You can read how to fix your Outlook problem on the internet, but sometimes the suggestions don’t work for your specific case.

The good news is that most “Outlook won’t open” errors can be resolved with a few proven troubleshooting steps. When you install Office, an Inbox Repair Tool (SCANSPST.EXE) is also installed on your PC. The Inbox Repair Tool can resolve issues by scanning your Outlook data files and repairing errors.

Customers with only a 3rd party email address set up as the username of their Microsoft Account will be asked to add a 1st party Microsoft alias to their account before accessing Outlook.com. This will cause The Turn on shared calendar improvements checkbox to be disabled for all users. The UI checkbox will be unchecked and disabled, so end users cannot turn on the improvements.

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. However, if you encountered other issues like Outlook not responding, learn how to fix Outlook not responding here. Click the above link to have a quick download, then you can have Outlook errors fixed within minutes. Check the solutions to Fix Outlook Stuck On Loading Profile (fixoutlookhelp.wordpress.com) “Outlook not opening” problem and how to avoid “Outlook won’t open” again. Here are some common fixes that should work when Outlook doesn’t open, whether you’re using Windows or a Mac.

These applications and services can interfere with Outlook. A Selective Startup or “clean boot” process can help you identify problems that are caused by application conflicts. Corrupted PST or OST data files can prevent Outlook from loading. Microsoft’s ScanPST tool can repair minor corruption