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MSExchangeIS and Port 1144

I have a server running Exchange 2007 on Windows 2003.  Lately we have noticed a lot of traffic being generated by port 1144 from the exchange server to other PC's.  Running netstat on the server it seems this is being generated by MSExchangeIS.

  TCP    SERVERNAME:1144         PCNAME.???.co.uk:1966  ESTABLISHED
  TCP    SERVERNAME:1144         PCNAME.???.co.uk:2623  ESTABLISHED

Is this normal activity.  

1 Solution
That looks normal.
Exchange works on a push capability. It sends a packet to Outlook to tell it that something has changed on the mailbox and for Outlook to go and look. That is done on a random port above 1024.

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