RE: Assistant Field Not Shown in Cache Mode or across child domain boundaries

  • From: "Ion Gott" <Ion.Gott@xxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 20 Mar 2006 10:22:43 -0800

I have thought about going this route....just curios on what others are dong.
If you make frequent changes to the Offline Address Book, you may want to 
modify the way that Outlook 2003 computers on your network access the Address 
Book. You can disable the downloading of the Offline Address Book and force the 
Outlook 2003 computers to use the online Global Address List when they use 
Cached Exchange Mode.

To do this, add the following registry value to the Outlook 2003 computers: 
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Cached Mode
Parameter: DownloadOAB
Value: 0

By using the value 0 (zero), the Offline Address Book is not downloaded 
automatically, and Outlook must contact the online Global Address List. For 
more information about the values for the DownloadOAB registry parameter, click 
the following article number to view the article in the Microsoft Knowledge 
823580 ( How to configure how the 
Offline Address Book is downloaded when you use Outlook 2003 in Cached Exchange 
As per this article, if Offline Address Book (.oab) files were previously 
downloaded and were associated with a MAPI profile for Outlook, this setting 
will not have the correct effect. To use this setting, you must set the 
registry value, remove any .oab files from the local computer, and then 


From: Ion Gott [mailto:Ion.Gott@xxxxxxxxxx]
Sent: Mon 3/20/2006 9:55 AM
To: [ExchangeList]
Subject: Assistant Field Not Shown in Cache Mode or across child domain 

The fact that the assistant field is not contained in the offline address book 
which is used when a client is in cached mode seems unacceptable to me when 
working in a large global enterprise.
Has anyone dealt with this issue and or have a work around to getting that 
attribute to be displayed when in Cached mode?
Also does anyone have any good metrics in regards to performance of a client 
after Exchange consolidation to a central site and the client being in cached 
mode as opposed to non-cached mode?


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