If you open MS Outlook and see an error message, Outlook is using an old copy of your Outlook data file (.ost), then use these fixes.

Microsoft Outlook is one of the popular email clients that is used by a lot of people worldwide for sending and receiving emails. Like Gmail, Outlook also has a feature to move specific emails to a ...

When it encounters an error, Microsoft Outlook automatically transmits an error report to the Microsoft support team. Problems can arise, however, when you receive a ...

Maybe try setting Outlook Express as the defauly and then switching it back. If that doesn't work I would probably just reinstall Outlook.

A new Outlook (Classic) update is preventing Windows users from opening encrypted emails. Microsoft confirms the bug and ...

A new Microsoft-issued software patch for Outlook (Classic) on Windows 11 inadvertently broke encrypted email support - ...