You are probably right, I have just noticed that one of the access is made by a
network service, not by the local
administrator. This might be the reason of the failed access, something like an access with a
bad agent-request that repeats for several hours, 3 times each five minutes.
But I think i'm not going to change the users that are running the services. The last time I did it took me a lot of hours to recover the backups because something went wrong, and the problem seems to be not so annoying

I'm still in fight with the OLAP cube. I don't know if we need it, but i want it to be available. I think i'm going to download a demo version of the SQL Server Standard and install the full
mops+
sqlserverstandard in a virtual machine to see what the cube is, and if it can do things like
showing all the vacation-day per user.
Anyway, thanks for your help. This site is much more useful than microsoft's one
