This is a really weird one, I'll try and explain as best I can!

Scenario(names are not the real ones BTW) -
RES - resource domain
AD - active directory

A server in the RES domain has sql server running under an account RES\SQL.
I connect to it with my own account which is in the AD and has full admin
access.

Fine so far, now I'll set a database to simple recovery mode. This works
fine and we continue as normal. Then I discover that during this process an
account in the active directory called AD\SQL has now been locked out!

I cant for the life of me see how this is happening with such a mundane task.

Any ideas?

Thanks, Mike
Thanks.