Question : certsrv.exe (1440) , i have been having this error since monday

Source : ESENT
Event ID : 215

certsrv.exe (1440) The backup has been stopped because it was halted by the client or the connection with the client failed.

wondering how could i fix the problem,

Answer : certsrv.exe (1440) , i have been having this error since monday

I dont think diagnostic logging will overload the server.

Here's how to do it.
http://www.computerperformance.co.uk/exchange2003/exchange2003_logs_diagnostic.htm

what will overload the server is - if you start Journaling emails on a regular exchange mail server.

>>  I know for sure that someone accessed my account just trying to find out who.
>>> Why do you think someone accessed your account.
If it's through Outlook - chances of figuring out who did that = ZERO.

If it's done through OWA - you can examine IIS logs