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The heartbeat values are currently set by the CAB to:
Minimum: 900 (15 minutes)
Maximum: 7200 (120 minutes)
Default: 1800 (30 minutes)
But the actual heartbeat interval is negotiated with the Exchange Server within the above range. These seem to be longer values than MS recommends (after scanning the MS knowlegebase). Of course, every MSFP client device is maintaining an open HTTPS connection all the time with the Exchange server (but not passing traffic) so your firewall folks will likely be tearing their hair out....
I've also seen some notes that seem to indicate that setting the maximum to anything greater than 59 minutes will have no effect because of DAV limitations.....
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