First of all, I'm going to say that Exchange is one of the best out there, be it from Microsoft or not. Millions of companies use it, there is a huge support base and it's upgraded quite regularly compared to some of Microsoft's other software.
What version of Exchange are you running? 5.5, 2003? Also, are you running Standard or Enterprise? The information and log stores on Standard edition only allow 16gb for each store. If you hit that size level, the stores will actually dismount with no warning. The Enterprise version will allow unlimited space usage for stores.
I'm assuming you have looked at the system and application logs in the System Manager? I'm surprised that nothing else is missing. And too, so you lost some email, at least you're doing backups and should be able to retrieve those, and any people sending your company stuff should be able to resend at your request.
Good luck.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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