Yikes! Same problem, but worse. I hope you can help.
My old identity was in Jaguar, and it is lost forever, becuase I
updated to Panther with a clean install. I saved the old "Microsoft
User Data" folder, but only that. The size of the files indicates that
it's the real thing (if not corrupted!) but Entourage doesn't like
these files. I think, reading your post above, that I have got the
Main Identity name wrong.
First, is there any way to find this identity name by opening the old
database in a text viewer?
My other identity was made in the same version of Entourage X. It was
the only identity.
I copied the files as directed, checked permissions, etc. which are
ok. But Entourage will not start with these files in the Main Identity
folder. It says "This identity cannot be opened with this version of
Entourage". It's the same version, of course, cause I only have this
version. But obviously I have the identity name wrong.