Hello, I'm running Exchange 2010 SP1 Rollup v3-3 and this problem has been before the first rollup version. Randomly 2-4 times in a month I have to restart the services microsoft.exchange.rpcclientaccess.service.exe because it takes 100% cpu. I can't see anything strange in my logs. All clients is running outlook 2010 Iphone with the new update(I´ve seen post about iphone and older version.) About 20 users Exchange is running on Vmware with dedicated 6 Gb RAM Anyone who has an solution or idea to help me with this? Thanks

Hello, try to install RU4: http://blogs.technet.com/b/exchange/archive/2011/07/27/announcing-the-re-release-of-exchange-2010-sp1-rollup-4.aspx Greetings, Toni

Ok, thanks for quick response. Could I just install RU4, or do I need to uninstall RU3-V3 before I install this update?

Hello, you don't need to uninstall RU3. Greetings, Toni