I have Exchange 2007 SP1 cluster with RU7. The mailbox server event viewer is full of Event 9646, MSExchangeIS messages. Mapi session "6a4e370c-955b-43ec-b87b-38cebae1e2ab" exceeded the maximum of 500 objects of type "objtFolder". When I am trying to find this GUID with different methods mentioned online then unable to locate this mailbox. Do not know what to do. Any ideas? MSFT's please help.

get-mailbox -ResultSize unlimited | where {$_.ExchangeGuid -eq "6a4e370c-955b-43ec-b87b-38cebae1e2ab"} Please refer below similar thread... http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/f62cee3e-6669-41de-8223-dd5940de0305 Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

I have read it but problem with me to find GUID. I tried this command get-mailbox -ResultSize unlimited | where {$_.ExchangeGuid -eq "6a4e370c-955b-43ec-b87b-38cebae1e2ab"}, but it does not show any info in EMS. Andy idea?

Ok, check with a tool called ADFind from JoeWare http://www.joeware.net/freetools/tools/adfind/index.htm I think syntax would be something like below... adfind -gc -b "" -binenc -f " msExchMailboxGUID={{GUID:6a4e370c-955b-43ec-b87b-38cebae1e2ab}}" dn Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Dear Amit thanks for your help, I found the matching user with this GUID. But when I visited his Outlook, he has has no any extra add-ins and working normally. What do you think then why these events are being generated on server?

Does user have more than 500 folders really? If so, may be during search or blackberry/activesync might be accessing all those at a time... You may check folders with Get-MailboxFolderStatistics cmdlet... (Get-MailboxFolderStatistics UserName).countAmit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

He is not using activesync/blackberry, just only Outlook 2007. The folder counts shows only 23 folders.

How frequently is this error coming? See how user is using outlook, I mean many sessions, messages, PFs messages etc... opened at a time. Also try by creating new Outlook profile and observe the event log... Ultimately you can increase the size as per registry key mentioned in below article... http://technet.microsoft.com/en-us/library/bb676486.aspx Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

As Amit suggested about increasing sessions in registry is valid. However, you still may need to think about Performance and Memory on Exchange Server also. Because it is going to implement to all users on the Server, performance may impact. V Bala R Krishna

Hi, The issue can be caused by the following factors: 1. You add a large additional mailbox to your profile or your mailbox has lots of folders. do you add extra mailboxes for that profile? 2. Some third party software. Please note some desktop search software can also lead this issue. If you have, please disable it and test the issue again. 3. Some network issue. Please install update KB912222 and try again. Windows 2003 Scalable Networking pack and its possible effects on Exchange http://msexchangeteam.com/archive/2007/07/18/446400.aspx You can also extend the limit by modifying registry keys. Thanks, Elvis