Hi All, Can you please share your experience ? Planned Exchange 2010 enviroment: - 500 users - No DAG - All users will use Voice Access/UM - All users will have archive feature (10Gb per user) - All users can be connected via Outlook Anywhere (RPC over HTTPS) We will use iSCSI disks for mbx db. Current enviroment: Exchange 2007. CAS/MBX/HT/UM roles are placed on one HP server. ISA 2006 as publishing server on the separated server. Server's configuration: DL360 G5 12Gb ram 2 CPU SAN iSCSI luns for mbx databases I checked HP Sizer for Microsoft Exchange 2010. It said, we need for my planned Exchange 2010 configuration two HP servers: DL360 G6, 1CPU, 16Gb ram for CAS/MBX/HT DL360 G6, 1CPU, 4Gb ram for UM If I change UM role assigment to one server, it recommended one server DL360 G6, 2CPU, 16GB ram. Will one DL360 G6/16Gb ram/2CPU process 500 users with UM and RPC over HTTPS ? Will I have any performance issues ? I read, RPC over HTTPS will add 20% overhead. The same questions for 350 users if there will be performance issue for 500 users. Thanks for advicesmcse^4

I tried 'Exchange 2010 Mailbox Server Role Requirements Calculator', but it doesn't help in my configuration (SAN LUNs and hardware snapshots). It said, I need 8 GB ram. At the moment Ex 2007 server has got 12Gb ram for 350 users. When there was 8Gb ram, we had memory issues, UM stopped working. We will enable UM for all users in Ex 2010. It will increase usage of Exchange server. Also will enable Outlook Anywhere (RPC over HTTPS). I don't see the accurate sizing tools. mcse^4

Have you checked with the Tools from HP and Dell http://h20338.www2.hp.com/ActiveAnswers/us/en/sizers/microsoft-exchange-server-2010.html http://advisors.dell.com/advisorweb/Advisor.aspx?advisor=b6372fc5-7556-4340-8328-b8a88e2e64b2-001ebc&c=us&l=en&cs=g_5

Hi all , I need some one to help me out for the server sizing of 350 users and mailbox size would be 2GB/mailbox.I need to install all the roles. Please suggest me if i can install all the roles (except edge server) on 1 single OS. also specify the sizing for edge transport role. Please tell me the hardware requirements and also let me know if its recommended to install all roles on same OS. Thanks You.