Gordon Prince, MCP wrote:

It seems like the .NK2 file is corrupt -- the names are there, but
they don't work. Is there a way to repair the corrupt file? Or does
it just need to rebuild a new .NK2 file as it gets used?

You could try creating a new mail file and before starting Outlook
afterward, name the NK2 file you want to use to match the mail profile name.
If that doesn't work, a new NK2 file is the way to go.
--
Brian Tillman