When you depend on Outlook for managing your emails, calendar, contacts, and tasks, errors like "Cannot Start Microsoft ...

Microsoft has admitted that an issue in Windows 11 24H2 could stop Outlook from starting. It has also been confirmed that Microsoft 365 Enterprise users will switch to the new Outlook in April 2026.

There's a reason for that. In a recent support article, Microsoft acknowledged that Outlook may crash when you start a new email or when you reply to or forward an existing email. To see which ...

How to Repair a Microsoft Outlook PST or OST file ... such as “the file [filename].pst cannot be opened.” Outlook fails to open or crashes when accessing the PST file. Emails, contacts ...