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Unable to open your default e-mail folder

I had a old user, yesterday logging into her NT account and when you opened Outlook 2003, she received the following message:
"Unable to open you default e-mail folders.  The Microsoft Exchange Server computer is unavaiable.  Either there are network problems or the Microsoft Exchange Server is down for maintenance."  
OWA doesn't work on her logon either. But there is nothing wrong with her email account as I (exch admin), can access her inbox with my user account.

I have tried the following:
  I deleted her Outlook profile and recreated, no success
  I deleted her Windows profile, no success
  l logged someone elses account onto her computer and they're Outlook and OWA works fine on her PC, therefore it is not a application or os problem.
  I have logged her on to another computer and the error follows her.
  I checked the mailbox rights on her account and she has full mailbox acccess
  I removed her email account from her user account in AD, recreated it. same problem.
  I created a copy of her account and the problem is still there.
and finally....
 I created a new user account, transferred her smtp address over to the new account to see if it works and it did. I then had to transfer all her permissions over.

Great, but the problem is.... it has now happened to 7 other users! Exactly the same.

Why is this suddenly happening? What is casing this? and is there any other solution to this problem apart from creating a new account and transferring all the permissions over ?
I can do this for these 7 users, but if it becomes a breakout, I will not be able to deal with it.
Need HELP!!!

1 Solution
Use microsoft tool PFDAVadmin to reset the permission to the user
spiritualrageAuthor Commented:
Thank you for the MS PFDavAdmin Tool, suggestion. I have downloaded it and installed it onto the server now.
I have had a look, but I can not see where I can reset the permissions for the user. Can you please drop me a few instructions.
Thank You.
ThinkPaperIT ConsultantCommented:
i'm having the exact same issue. =/ still trying to figure it out..
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spiritualrageAuthor Commented:
I have found the course and a solution, but have no clue why it happened.

It was due to a corrupted group. It is very weird. The list of users in that group was not affected at the same time but one by one.
That group was a universal security group used to permission only data folders.
What I did was choose a user account which was affected.  Bit by bit (giving some time for replication between servers), i removed groups (security group or distribution group) out of her account, till Outlook started to open. Then I removed all the other users out of that group and their Outlooks also started to work again.

There doesn't seem to be any consistancey or logic to the problem and I don't know why it happened.
Any clue?

spiritualrageAuthor Commented:
The solution to this problem ..... the max token on the kerberos.
Read this arctical:
New resolution for problems with Kerberos authentication when users belong to many groups =
The reg change needs to be added onto the domain servers as well as the users workstation.
We are also experiencing issues with AD and the OWA but only with some people when we leave them into a large group. The kerberos doesn't resolve these 2 problems.

That's it. I hope this helps all those that are stuck with this.

PAQed with points refunded (500)

EE Admin
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