I'm running Exchange 2k7 SP1 in somewhat of a hosted environment. I haven't added any mailboxes to the server in about 2 months, from 3/3 to 3/23/2010, the db grew from 41,212,304kb to 41,216,528kb, pretty much nothing, then on 4/12/2010 it was at 42,943,120 and grew to 45,105,936 in 8 days!!! The db is now at 46,269,200 and just grew about 3 minutes ago.
I've been watching exmon, and my number one client is the "?" at 127.0.0.1 which according to my research is some sort of a hub transport issue, I guess this makes sense as hub transport is on this same server. I've added up the mailbox sizes, and they add up to about 35GB, so given the fact that we have a 30 day deleted item retention, I expect the db to be a little bigger than that number, but not by nearly 11GB.
I've been looking in the queues to see if something is in some sort of a loop, but I can't find anything. Any ideas? This makes me quite nervous as this is a production server and I have zero (0!) db experience.