I recently tried synchronising my wifes new P900 on my computer and got the following error:
"The Microsoft Jet database engine cannot open the file �C:\Documents and Settings\All Users\Application Data\Sony Ericsson\Sync Station\hermes.mdb�. It is already opened exclusively by another user, or you need permission to view its data."
We have different user accounts but are both administrators so that can not be the problem.
I reinstaled the PC Suite and tried synchronising her phone and it worked. Only problem was that following this I had the same error when I tried to synchronise mine.
It would seem that as soon as one person synchronises for the first time it locks to that person.
I have emailed Sony Ericsson support but if anybody can offer any help it would be VERY welcome!