If you see the error message :-
The User has insufficient access right
When trying to delete, move or carry out other operations on a mailbox do the following :
AD Users and Computers
View, Show Advanced
Double click on user
Click Security
Click Advanced
Tick the box include inheritable permissions
Log onto the mail server.
Open up a command prompt as administrator.
Run the following command :-
ldifde –f c:\addresses.txt –l proxyaddresses
This will create a file in c: called addresses.txt. You can then open it and find the address you are after.
In the previous versions of Exchange Server we cannot play with the mailbox rules limit that is only 32kb (http://support.microsoft.com/kb/886616). Using Exchange Server 2010 we can do that through Exchange Management Shell. Let’s see how to do that..
The cmdlet utilized to set up the mailbox is called set-mailbox:
Set-Mailbox
Let’s change the user Anne to 256KB limit using set-mailbox.
Set-Mailbox annec -RulesQuota:256KB