28002 Error Unknown with Team Foundation Server while installing SP1
I was just chatting with Dave Glover and he mentioned he had just finished upgrading our Team TFS Server to SP1. Unfortunatley his first attempt failed the error: "28002 Error Unknown" -of course naughty ole Dave hadn't read my post about Backing up the server before applying SP1! Luckily he found the answer to the problem pretty quickly:
The work around is to remove one of your users from the "Team Foundation Licensed Users" Membership Group.
For more information see Daves post:
Upgrading to Team Foundation Server SP1 – Workgroup Version and a Gotcha!!
Thanks Dave!