warning in windows 2012 (running exchange 2010) application event log

I have been looking at the Application event log on our Windows 2012 server, which is running exchange 2010.

I notice the following warning that crops up throughout the day, (with no other warnings apparent.) :-

The execution time of agent 'Mailbox Rules Agent' exceeded 90000 milliseconds while handling event 'OnDeliveredMessage' for message with InternetMessageId: 'Not Available'. This is an unusual amount of time for an agent to process a single event. However, Transport will continue processing this message.

This seems a rather vague message.

Can anyone advise in a little more detail what this indicates, and how we go about resolving it?

Many thanks.
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nigelbeatsonAsked:
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btdownloads7Commented:
Please see this answer
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Windows Server 2012

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