User account unable to open any mailboxes in Outlook 2003 on Exchange 2007

* Check the network settings for the machine from which he is trying to access his mailbox.
* Ping to the Exchange Server from his mailbox and see if it replies to it or not.
* This surely seems to be an issue with network settings.
* Check DNS settings.
* Telnet to port 25 (SMTP) from his machine to the Exchange Server and see if that works fine.


Report back with your findings and this will help us to divert you in the right direction.

#wyn

This actually happens from any machine on the network.  Sorry, I forgot to mention that.

* Ask this user to configure his Outlook on another machine and check if he's able to access it successfully from there or not, if he is then will need to investigate upon mentioned points.
* Since you mentioned that this user can access his mailbox successfully via OWA, then it doesn't looks like a permissions issue on his own mailbox.
*Try to configure a new mailbox profile on his Outlook and that could resolve it, but it's important that the computer from which he's trying to access his mailbox via Outlook is on the domain and is able to connect i.e. ping to the Exchange Server.

#wyn

I understand what you are saying that it may not be a permisions issue because he can access the mailbox from OWA.  The interesting thing is that I can go to any machine on the network (where other user's can open their mailboxes) and create a new profile for this user and he still is unable to open his mailbox or any other assigned mailboxes.  Yet If i grant a different user access to his mailbox thay can open it just fine.  It is very strange indeed.

So if this user creates a new Outlook profile on another user's machine and tries to access then it gives same error.
And if other user tries to access his mailbox from that same machine then it lets them access his mailbox (Keeping in mind that they have access to his mailbox)
Try resetting his permissions on his own mailbox. Grant the account 'SELF' Read and Full Mailbox rights on his AD account.

The below link could be useful however this should not actually be the precise solution in case if it works:

http://www.davidunderwood.org/2007/10/02/Exchange2007WithOutlook2003ClientUnableToOpenDefaultEMailFolders.aspx

Try resetting his permissions on his own mailbox in Exchange 2007 or from AD and then ask him to login and try it again.

#wyn

It seems Exchange 2007 connection session timed out for this user and has filled in the max of 32 connections. Check the links below, this is user specific issue:

https://www.experts-exchange.com/questions/23472592/exchange-2007-unable-to-open-default-emial-folder.html

http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1892039&SiteID=17

#wyn

Hey #wyn!
I joined this site some months ago and was wondering when I was going to get my money's worth!  I just got my money's worth.  The last link you sent had the fix in ther.  Here it is coutesy of CorpTECH LLC...
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Fix the issue with Exchange Command Shell using this command:

add-adpermission -Identity "User Name" -user USERID -AccessRights extendedright -ExtendedRights "View Information Store status"

Fill in each persons username, and Identity name.

****The MSExchangeIS information store has to be restarted to apply these AD Permission Changes.****

Glad to know that the link helped and thanks for pointing out the resolution task to fix the issue as it will now help others as well.
If you think your issue has finally resolved then you could close this question.
Cheers!

#wyn