Help – Exchange 5.5 Error Messages

We are getting the following two errors on our Exchange 5.5 SP4 server.

An error occurred.

Function name or description of problem: EcProcessSearchMessageEvent

Error: 0x80040304
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An error occurred.

Function name or description of problem: EcTestMsgRestriction

Error: 0x80040304

There is not much information about this on Microsoft’s site and I am not finding any resolutions on the Usenet groups. Has anyone experienced these errors and is there a fix for the problem? Thanks in advance.