The Reread Logon Quotas Interval value depends on the Directory Service Access (DSAccess) cache and the mailbox information cache.
You can specify users, contacts, or distribution groups.
Microsoft Exchange Server 2007 will reach end of support on April 11, 2017. For more information, see Resources to help you upgrade your Office 2007 servers and clients.
If you are using Outlook 2010 or later your quota and current mailbox size is displayed when you go to; File-There is no way to see your mailbox quota directly in Outlook 2007 or previous.
However, you can always ask your Exchange administrator of course.
If you want to immediately reduce the size of the file, you can force a compaction.