Unity pings the services on all Exchange servers that house one or more subscribers' mailstores for us - if the response time is too slow (or not existant) it will mark the server as being off line since if we try to log into that mailstore MAPI has _really_ long timeouts that can cause us to burn a port. While we think the server is off line we wont allow subscribers homed on that server to check their messages. We will continue trying to ping the server and if we get an appropriate response back indicating the message services on that box are up and flying we'll mark the server as being on line again (that's the event log message you're seeing).
It sounds like you may be having some connectivity issues with one or more Exchange servers in your network or some bad latency issues or the like.
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