Hi All I have been scrratching my head in the last few weeks on slowness problem on exchange 2010. User are experiencing slow response from outlook during the day on a random basis. I put perfmon to the task and monitored RPC requests and operations. For some unknown reason, i see that rpc requests and operations are happening in almost timed bursts. Occasionally they graph seem to level out but its contstantly these bursts. The RPC Requests are always below 200 but they happen in bursts. Operations also occur on similar fashion but usuallly below 20000. Below is the graph showing the trend, I am suspecting this to be the cause for slow response. Regards Herbert Zimbizi

Using the rpc operations/sec is not a good counter to view unless you've been capturing a baseline for historical reference. Use the threshold counters below you don't need to add all of them start with the basic such as disk IO and rpc counters, but use the rpc counters that actually have hard thresholds ie should be less than ..... Also you should get to SP2 RU3 now. Active Database Copy I/O Latency Requirements Counters http://technet.microsoft.com/en-us/library/ff367871.aspxJames Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

James Thanks, you see my dilemma in this case is that, this does not happen to everyone. Only some users, infact it almost looks like the same users are affected. I have a situation where out of two users on the same network, db and in same site have different experiences. One user is extremely happy and the problems at hand are largely unknown to him/her. While the other will almost complain daily. SP2 Update 3 is not an option at the moment Regards Herbert Zimbizi

If it is a user issue 1. How big is this user's mailbox specifically how many items does he have per folder? What version of outlook? 2. Is user in cached mode? If so try taking the user out 3. Have the user run outlook /rpc and note the connect time and compare with another good user 4. Have the user work in outlook /safe and see if it's better 5. Open exmon and monitor this user and see if you notice unusual high activityJames Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

thanks, will have to do this tomorrow. 1. How big is this user's mailbox specifically how many items does he have per folder? What version of outlook? All versions affected outlook 2010/2007 Affected Mailboxes are between 450Mb and 2Gb 2. Is user in cached mode? If so try taking the user out - Online Mode(Citrixed Mode, and they do complain sometimes. 3. Have the user run outlook /rpc and note the connect time and compare with another good user . Will test 4. Have the user work in outlook /safe and see if it's better. This did not help. I have already done this 5. Open exmon and monitor this user and see if you notice unusual high activity. Used Exmon before could not pick unusual activity. Will test tomorrow with one affected userRegards Herbert Zimbizi

Your users are running outlook on citrix? All of them?James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

yes certain percentage of affected users are using outlook on Citrix and these have been the most affectedRegards Herbert Zimbizi