How to resolve the Outlook Not Opening issue?
If Outlook is Not Opening, scan your system for viruses, trojans, spyware, and other malware. If an issue is discovered, use your security program to address it, then restart your computer and attempt restarting Outlook again.
Repairing Outlook is another option. It's possible that the Outlook application has been damaged. To fix it, use the built-in Microsoft Office repair program. If the problem persists, repair the Outlook data files. If Outlook still won't open, try using the Inbox Repair tool to identify and perhaps resolve the issue.