Outlook Web App couldn't initialize. Invalid forms registry file %1 Line number = %2 Position = %3. You can't define a base ...

Outlook Web App couldn't initialize.

Invalid forms registry file %1  Line number = %2  Position = %3. You can't define a base experience when you choose to inherit from another forms registry. The base experience of the other forms registry is always used.

The forms registry is a critical component of Outlook Web App. If this error isn't addressed, users might not be able to access Outlook Web App. The Help and Support Center provides information about troubleshooting the forms registry.