Are there any accepted best practices out there for the limits of Mailboxes sizes. Most of our users have 100-200 MB mailboxes. I have a couple of users who claim to need 1-2 GB mailboxes. Is there any technological down side to allowing this size mail box. In addition it would seem that we will need to upgrade to the enterprise version of exchange 2003 to accommodate this (our total mail store size would be too close to 16GB for comfort). Are there any issues associated with the switch to enterprise 2003 Thanks Lloyd