I have a client that has to reset the Info Store on a weekly basis.. the message that they receive in the application event view is below.
Exchange store 'First Storage Group\Mailbox Store (FOODSCENE-MAIL)': The current physical size of this database (the .edb file and the .stm file) is 19 GB. This database has exceeded the size limit of 18 GB. However, the logical free space in this database has not yet been evaluated. Therefore, it is possible that this database contains enough free space to bring its logical size below the maximum size limit.
If the logical database size exceeds the maximum size limit, it will be dismounted on a regular basis.
This shows up as event ID 9685 source is MSExchangeIS Mailbox.
i have Service Pack 2 installed on exchange which, i thought, should push through this limitation.