Error: "Format of the following file is not supported: '<full path to .pst fiel>'" when registering (4321981)

When you use the Add Storage Wizard to register a .pst file, the registration operation may fail with the error "Format of the following file is not supported: ''." This problem occurs if the .pst file you are trying to register is password-protected.

The expected behavior is that while the registration operation is in progress, the Add Storage Wizard should prompt you to type a password for the password-protected .pst file.

WORKAROUND

1 Use Outlook to open the password-protected .pst file you want to register.

2 Type the password for the .pst file when prompted by Outlook.

3 Keep the file open in Outlook.

4 Use the Add Storage Wizard to register the .pst file as a storage.

STATUS

Waiting for a fix in the future release of Recovery Manager for Exchange.