I have 500 users running on Exchange 2007 CCR on a SAN. My mailbox store size is around 50GB and most of my users are currently limited to a 100 MB mailbox size. We have room to grow and I've been thinking about raising the mailbox size limits and I was just curious what limits most other Exchange Techs are setting.Thanks,Eric

Hello Eric, I have mailbox limit starting from 100MB to 2GB in my environment and some VIPs with no limits too. It depends on various factors how it is feasible for your environment, storage scalability, database design, server performance, recovery process, workstation performance, outlook mode (online/cache) etc.. You may refer below article for Planning large mailboxes. White Paper: Planning for Large Mailboxes with Exchange 2007 http://technet.microsoft.com/en-us/library/cc671168.aspx