Really good article here:
Solves the problem of the database reaching max capacity, and also speeds things up in general.
In SBS 2008, run the contents of this zip file in an administrative PowerShell window.
In SBS 2011, run this as administrator:
C:\Program Files\Windows Small Business Server\Bin\MoveDataPowerShellHost.exe
and then run the contents of this zip file within it.
If it says “1 row affected”, it’s done, and the messages will point out old MDF and LDF files to remove.
You may notice that the script linked here is just a tad different than the one on the itquibbles page; this one just adds the -force items mentioned as an option on that page.