Cannot open the Outlook window. Check if you’ve configured Outlook to run in compatibility mode (either manually or by running the Troubleshoot Compatibility wizard).

A File Cannot Be Opened in Microsoft Office Outlook. If you cannot open Microsoft Outlook for some reason, it can make communicating with employees, clients or suppliers rather difficult in some ...

Cannot start Microsoft Outlook, The command line argument is not valid 1] Open Outlook Safe Mode & disable add-ins Safe Mode of Outlook can help detect the problems you have with your Microsoft ...

Can’t Open Outlook or Access emails When the user can’t access their emails in Outlook or receives errors, such as xxx.OST is not an Outlook data file or cannot open Outlook, it means there is ...

I cannot tell you how many times I’ve seen Outlook connectivity issues resolve with a simple restart. The issue could be caused by the computer having connectivity issues.