Outlook 2003 is getting an error when trying to open an exchange 2010 mailbox

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D

DaveHoward79

Hi all,
this has been an ongoing problem for me for sometime and i am now running out of ideas!

I have a mixed exchange 2010\2003 infrastructure. All staff on Outlook 2003 with encryption on the CAS server set to disabled. The problem is when an exchage 2003 user trys to open a users mailbox that is on the 2010 database they are getting an error 'Unable to Expand the folder. The set of folders could not be opened.

The Exchange 2003 user has about 3 or 4 exchange 2010 mailboxes added into there Outlook client along with an additional 10 exchange 2003 mailboxes. They can open the 1st 2010 mailbox, but ANY additional mailboxes they try to expand after this they get this error. If they close Outlook down, and try opening a different 2010 mailbox, this opens succesfully but again, any additional mailboxes we get the same error again?

I have read that this is because of the Throttling policy that is set which limits the amount of RPC connections in exchage 2010. I have created a custom throttling policy, set all RPC settings to Null and applied the policy to ALL the 2010 mailboxes i am having this problem with, but still getting this same issue? I am also aware that microsoft reccomend no more the 16 mailboxes added to Outlook as this can cause issues well but this is not a problem as the person is below this number

Any help would be much appreciated!
 
S

Steve Goodman

Hi Dave,

Have you updated to Service Pack 1? There were a number of fixes related to this functionality?

Steve

Steve Goodman
Check out my Blog for more Exchange info or find me on Twitter
 
S

Steve Goodman

Hi Dave,

OK - SP1 does usually solve most of that type of issues, in that I would recommend reading this Technet Wiki article: Concern: Is having Outlook 2003 clients going to prevent me from deploying Exchange 2010? and looking at the " Opening multiple shared calendars & additional mailboxes" section.

Instead of setting the limits to $null you may want to try the numbers and then follow-on steps in that article. Let us know how you get on with that, or if you've already tried the wiki steps.

Steve

Steve Goodman
Check out my Blog for more Exchange info or find me on Twitter
 
D

DaveHoward79

Hi Steve, i have installed the Exchange 2003 Hotfix and all now seems to be resolved.

Many thanks for your efforts
 
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