Exchange 2010 SP1 . 16 GB of RAM and dual CPU .
Our exchange server data store is about 105 GB on disk.
When I export mailbox sizes to excel (from shell) , The whole thing is about 80 GB .
Two questions :
1- what else can cause mail store to be 20 GB over estimated size ?
2- Is 100 GB too big ? server runs smoothly at the time.