Outlook 2007 opens wrong mailbox on Windows 2008 R2 RDSH

Question

Hi,
For a few weeks now we randomly receive messages from our users that they cannot access outlook 2007 (connecting to exchange 2010 sp3 ru5 using DAG). When investigating it turns out that outlook tries to open a different users mailbox. We never had this
problem before.
Does anyone knows how to solve this. When adding the right credentials it works good. It seems like autodiscovering fails somewhere but I don't know for sure.
Some help needed.
best regards
Sijtze van Dellen

Answer 1

Cached Exchange mode is possible within a TS environment on Windows Server 2003. It is also Possible with Windows Server 2008 R2. It is however not recommended.
Please note, the following instructions apply to the following products only (although can most likely apply to others). As always, edit the registry at your own risk, but I have not had any issues with this.
-Server 2003 TS & Server 2008 R2 RDS
-Outlook 2003/2007
Server 2003 TS & Outlook 2003/2007:
1.) Open the registry editor on the account needing access to cached mode.
2.) Navigate to the following key:
HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\%profilename%\13dbb0c8aa05101a9bb000aa002fc45a
3.) Edit the following key:
00036601     (REG_BINARY)
4.) Depending on what you are after, change the value to one of the following:
enabled value;  84 01 00 00
enabled with Public Folders/Favorites: 84 05 00 00
disabled value; 04 00 00 00
Server 2008 R2 RDS & Outlook 2003/2007:
(Note - You will need to know how to identify user by SID. Instructions on this at the bottom)
(Note- User must be logged in to appear in HKEY_Users)
1.) Open the registry editor on the admin account.
2.) Navigate to the following key:
HKEY_USERS\%userSID%\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\%profilename%\13dbb0c8aa05101a9bb000aa002fc45a
3.) Edit the following key:
00036601     (REG_BINARY)
4.) Depending on what you are after, change the value to one of the following:
enabled value;  84 01 00 00
enabled with Public Folders/Favorites: 84 05 00 00
disabled value; 04 00 00 00
How to identify User's SID:
1.) Open Registry Editor and navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
2.) Under the ProfileList key, you will see the SIDs. By selecting each one individually, you can look at the value entry and see what user name is associated with that particular SID