We have a multi-role Exchange 2010 server with about 800 users on it. Sporadically through the day our 3rd party monitoring package complains that our Outstanding RPC requests _Total has exceeded the threshold (Which is apparently 0). I monitored for a bit using perfmon and the requests were averaging 1 - 10 outstanding. Is this a Major issue? Is it time to start thinking about scaling out?

Should be zero at all time, seems like the load is increasing some where http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/197816a7-6628-46d5-96fc-c58e141747d3#f2b3aae1-12a2-4f60-87b1-860d40927944 http://technet.microsoft.com/en-us/library/ff367871.aspxSukh

Just as aside, ensure you are at the latest SP and RU for 2010 as well. I recall that RTM had some issues around this.

We are running Exchange 2010 SP2 RU1 I believe.