We are migrating from Exchange 2003 with no quota settings to Exchange 2010 with limited mailbox sizes. We are trying to get users to clean their mailboxes prior to the move to reduce the transfer load, as well as to comply with new quotas on the 2010 system.

But many users access their mail through webmail only. I cannot see a way for users to access their mail store size in this manner.

Has anyone else run into this problem? Is there a good way to easily let users check their own mailbox size? The only thing I've come up with as a workaround is a report that IT generates and mail-merge it out to users daily with their current mailbox size. This is cumbersome and time consuming compared to a way for them to check their own mailbox size however.