Unable to expand the folder. The set of folders could not be opened. The operation failed.


When I add a mailbox using the Tools > Services > Exchange > Properties > Advanced, I keep getting an error message in the Folder View that says "Unable to expand folder. The set of folders could not be opened. The operation failed."  But if I go through File > Open > (whatever mailbox), it works that way.  I have set the appropriate permissions on the mailbox I'm trying to access, and Microsoft's knowledge base says to make sure the "Folder Visible" option is checked, which it is, but I'm still having problems.  Please help.

And this problem happens on certain mailboxes and not others.  All my users are using Outlook 2000 and Exchange 2003 Server.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

You should have full mailbox access permissions. No others will work - such as granting permissions to each folder.
I also find that after changing the permissions on a mailbox, you need to close and then restart Outlook on your own machine to access the other mailbox. If you have multiple servers then it may take a few minutes for permissions to replicate to all servers.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
krazedantAuthor Commented:
Thanks Simon.  I actually tried that after I posted this message and everything works like a charm now.  Thanks anyway!  Appreciate it.
I was able to FIX this one by giving the "EVERYONE" group the "RECEIVE AS" rights to the "Mailbox Store" (Within Exchange System Manager). Before that I also followed Microsoft KB839531 but that in itself didn't fix it.

My configuration is as follows:
- Windows 2003 Server with Exchange 2003
- Clients running Office 2003

The weird thing is that even as an Administrator I would get the "Unable to expand" message.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.