Exchange 2003 Mailbox store dismounts

I am administrating an old Small Business Server 2003.
For some strange reason the mailbox store dismounts every secon day.
When this happens I can simply mount the store again without any problems.

The Exchange database is located at E:\EXCHSRV\MDBDATA\PRIV1.EDB.

1) I can confirm that there is plenty of available space on drive E
2) The database is only 10GB so its not the famous 18gig limitation!

Can anyone point me in the right direction?
Who is Participating?
Nagendra Pratap SinghConnect With a Mentor Desktop Applications SpecialistCommented:
Is there any event in system and application logs?

What is the exact time it does this?
TazDevil1674Connect With a Mentor Commented:
From memory, there is a registry key that needs ammended to use up to 18GB.

jennylembertConnect With a Mentor Commented:
I have seen a similar problem before. I am sharing the links that helped me resolve the issue.
Hope it helps.
Good Luck.
OhmitAuthor Commented:
Guys! sorry for using your time.
This error shows my lack of knowledge!
I assumed that the 18gig limit was per database EDB + STM.
The total amount was beyond this limit causing an imidiately dismount!
I will expand this limit ASAP.
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