An error occurred on database "First Storage Group\Public Folder Store"

I received the following error on my Exchange Server today:

Source:            MSExchangeIS Public Store

Event:              1025

Description:       An error occurred on database "First Storage Group\Public Folder Store (LA-MAIL2)".
 Function name or description of problem: FEqEntryId
Error: 0x80040107

When I click the link it says contact MS.  Unfortunately right now we cannot call MS Support.  What is causing this error?  It happened over a period of about 20 seconds in the Event Log and never came back (it was this morning).

Windows 2003
Exchange 2003 SP1

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I have seen this random error on a 2003 server that I manage as well--happens once a week or so. I have never seen any issues resulting from it. The only link I can find which remotely explains what may be happening is this one.

Otherwise, there are people out there getting the same error periodically but I can't find anyone who's had actual problems traced to it or who can give much more info. Microsoft site is pretty empty on this one.

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