We have a fairly small company, around 35 employees. We have a single Exchange 2003 server, and the database size is about 51GB. It takes a long time to do an offline defrag, and about 4 of our sales and marketing employees use email pretty much every evening (after hours) and on weekends. In addition, we have three employees based out of Taiwan, who use their email during our down time, so it's hard to get the mail server offline for more than a couple hours. What I would like to do is move the Taiwan and Sales and Marketing people to their own mailbox store so that I can do an offline defrag after hours for the bulk of the users, and use the weekend to do the sales/Taiwan employees, but because their store will be considerably smaller, it shouldn't take to long to defrag.
My questions are 1) I am very nervous about doing anything to disrupt our mailboxs, especially with regards to the marketing and sales guys. This our most critical business app (exchange), and I just worry about "messing" with it. Is moving mailboxes a pretty basic and safe thing to do? 2) How often should I be doing an offline defrag? Currently, I get to it about once a year. 3) With our database size around 51GB, I think the maximum limit for Exchange 2003 with service pack 2 is 75GB. By moving mailboxes, I can get our main mailbox store reduced in size to give more time before our 75GB limit is reached. However, is this 75GB limit for the entire server or each store? Both mailbox stores are in my "first storage group"