I'm in a Exchange clustering session now, the speaker just told the best practices on choosing active/active or active/passive scenarios for Exchange clustering.

I knew MS had active/active issues with Exchange clustering, I brought that in the open 4 years ago: http://veryold.bink.nu/exchange_2000.htm [:D]

Now Microsft highly discourages active/active scenarious, saying if you have that running switch to a active/passive solution. In Exchange 12 active/active support will even not be available![:O]

Exchange cluster models

Active/Passive is the strongly preferred model
  Fewer EVS’ than nodes
  Must use if more than two nodes
Active/Active is the strongly discouraged model
  Maximum of two nodes and maximum of two EVS’
  Maximum one RSG per cluster (824126)
  Limits number of concurrent MAPI users per node to 1,900
  Limits average CPU utilization on each node to 40%
  Two instances of store running in one Store.exe process; not enough contiguous virtual memory to bring �B;resource online

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