Information Store Shuts Down Around 12:30AM Every Night

Email works great all day, no problems until the morning when the Information Store is dismounted and I get the below error. Any ideas?

Event Type:      Information
Event Source:      MSExchangeIS Mailbox Store
Event Category:      General
Event ID:      1216
Date:            4/12/2009
Time:            4:24:04 PM
User:            N/A
Computer:      DPE-SBS
The Exchange store 'First Storage Group\Mailbox Store (DPE-SBS)' is limited to 18 GB. The current physical size of this database (the .edb file and the .stm file) is 18 GB. If the physical size of this database minus its logical free space exceeds the limit of 18 GB, the database will be dismounted on a regular basis.

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itconsultant7717Author Commented:

Thank you.
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