Microsoft reports that the “improvements in Windows Server 2008 R2 more than doubles the number of concurrent users a given server can support, assuming CPU is the limiting resource.” “We recently compared performance of Exchange 2010 Client Access role supporting Outlook Anywhere users on both Windows 2008 SP2 and R2. Client Access Server was: 8-core Xeon server (2L5335 Xeon 4-core processors @2 GHz, 2007 chip design) running R2 with 16 GB RAM. It was supported by: two servers running Mailbox role, with 16 databases per server; Hub Transport server; and Active Directory server. Users were simulated from 10 client machines, running Exchange Load Generator 2010, using Outlook 2007 Cached module and OutlookAnywhere_100 profile (formerly known as ‘Heavy Profile’ – 20 sends and 80 receives per day). We found CPU consumed per user (MHz/user) increased linearly on both Win2008 SP2 and Win2008 R2. However, as shown on the graph below, the slope is 10 times smaller on R2. The cost of Exchange processes, dominated by Exchange.RPCClientAccess.Service process, was independent of operating system.”
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