Microsoft does have some recommendations on the size of the Exchange database that you may want to keep in mind: "Microsoft recommends that information store databases grow no larger than 50 GB. Assuming proper maintenance, there are no operational issues with running mailbox stores larger than 50 GB; however, backup and restore times may make larger mailbox stores unsuitable for some service level agreements (SLAs)." The article that I found with this information can be found at http://technet.microsoft.com/en-us/library/aa995715.aspx Ashley N. Shillinger Systems Administrator Research Technology and Support Facility & Great Lakes Bioenergy Research Center Michigan State University 202-D Biochemistry Building [log in to unmask] | T. (517) 353-6794 On Aug 3, 2009, at 10:07 AM, Al Puzzuoli wrote: > My exchange server has begun throwing event 9690s, complaining that > the > size of the database is acceded 18 GB. The article at the below URL > describes a registry setting that will increase the size limit: > http://tinyurl.com/e2j6q > > Any reason not to do this? I have plenty of free space on the > volume. > Thanks, > > Al >