I run a SBS 2011 on a Dell PowerEdge T320, 16 GB of RAM. Exchange Store is using all the available RAM (more than 7 GB). I tried to limit that behavior and I set the msExchESEParamCacheSizeMax to 131072 (4GB) and the msExchESEParamCacheSizeMin to 32768 (1 GB). It works only until users start connecting to the Exchange Server and then it jumps back to over 7 GB.
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