Cannot open your default e-mail folders. You do not have permission to log on.

I'm very new to Exchange 2010 and am trying to figure out what is going one with on user.  When opening outlook he gets:

Cannot open your default e-mail folders.  You do not have permission to log on.

When I run:  Get-MailboxPermission -id dr** |FL

I get:

RunspaceId      : dfc24400-6382-4436-b977-c27dfe4858aa
AccessRights    : {ReadPermission}
Deny            : True
InheritanceType : All
User            : Everyone
Identity        : domain.net/ITMgmt/Drd**
IsInherited     : False
IsValid         : True

RunspaceId      : dfc24400-6382-4436-b977-c27dfe4858aa
AccessRights    : {FullAccess, ReadPermission}
Deny            : True
InheritanceType : All
User            : domain\Domain Admins
Identity        : domain.net/ITMgmt/Dr**
IsInherited     : False
IsValid         : True

<<More permissions below>>

When I run the same on my account, I do not get the Deny:True listings.

I've seen several sites that indicate changing the Deny:True to Deny:False, but I'm having issues finding the right script to use.

Thanks in advance,

Dave