Hi Eric,
Thanks for posting here!
According to your description, I understand that your clients have poor
performance after enabling Cached Exchanged Mode. If I have misunderstood
your meaning, please do let me know.
Have you set for the RPC over HTTP in Outlook 2003?
When you use Microsoft Office Outlook 2003 to connect to a Microsoft
Exchange Server 2003 e-mail server by using a remote procedure call (RPC)
over HTTP, Outlook 2003 may perform slowly or stop responding (hang).
For more information, please refer to the following KB article: 331320
Outlook 2003 Performs Slowly or Stops Responding When Connected to
http://support.microsoft.com/?id=331320
Moreover,some Outlook features reduce the effectiveness of Cached Exchange
Mode because they require network access or bypass Cached Exchange Mode
functionality and cause bad behavior. The primary benefit of using Cached
Exchange Mode is being shielded from network and server connection issues.
Features that rely on network access can cause delays in Outlook
responsiveness that users would not otherwise experience when using Cached
Exchange Mode.
The following features rely on network access and can therefore cause
delays in Outlook unless users have fast connections to Exchange data:
Delegate access
Opening another user's calendar or folder
Using a public folder that has not been cached
In addition, some aspects of certain Outlook features also require network
access to retrieve necessary information ¡ª such as looking up free/busy
information ¡ª which can cause a delayed response even when users have fast
connections to Exchange data. The delays can occur unpredictably, rather
than only when the feature is accessed by the user.
It is recommended that you disable or do not implement the following
features - or combination of features - if you deploy Cached Exchange Mode:
Instant Messaging integration
If users right-click on the Person Names Smart Tag in an e-mail message
header, Outlook checks for free/busy status for that person. You can
disable Instant Messaging integration by using Group Policy. For more
information, see Configuring User Interface Options in Outlook 2003.
The toast alert feature together with digital signatures on e-mail messages
To verify a digital signature, Outlook must check a network server. By
default, Outlook displays a toast message that contains a portion of an
e-mail message when new messages arrive in a user's Inbox. If the user
clicks on the toast message to open a signed e-mail message, Outlook checks
(using network access) for a valid signature on the message.
Multiple Address Book containers
Typically, the Address Book contains the Global Address List (GAL) and user
Contacts folders. Some organizations configure subsets of the GAL, which
are displayed in the Address Book. These subset address books can also be
included in the list that defines the search order for address books. If
subset address books are included in the search order list, Outlook might
need to access the network to check these address books each time a name is
resolved in an e-mail message a user is composing.
Custom properties on the General tab in Properties dialog box for users
When you double-click a user name (for example, on the To line of an e-mail
message), the Properties dialog box appears by default. This dialog box can
be configured to include custom properties unique to an organization ¡ª
such as a user's cost center. If you add properties to this dialog box,
however, it is recommended that you not add them to the General tab.
Outlook must make a remote procedure call (RPC) to the server to retrieve
custom properties; because the General tab is shown by default when the
Properties dialog box is accessed, an RPC would be performed each time the
user accessed the Properties dialog box. As a result, a user running
Outlook in Cached Exchange Mode might experience noticeable delays when
accessing this dialog box. To help avoid such delays, you should create a
new tab on the Properties dialog for custom properties, or include custom
properties on the Phone/Notes tab.
Another way in which the benefits of using Cached Exchange Mode can be
reduced is by installing certain Outlook add-ins. Some add-ins can bypass
the expected functionality of Headers Mode (Download Headers Only) in
Cached Exchange Mode by accessing Outlook data by using the object model.
For example, if you use Microsoft ActiveSync? technology to synchronize a
handheld computer, full Outlook items will be downloaded, not just headers,
even over a slow connection. In addition, the update process will be slower
than if you downloaded the items in Outlook because one-off applications
use a less efficient type of synchronization.
Some more information about about Cached Exchange Mode, please visit the
link:
http://office.microsoft.com/assistance/preview.aspx?AssetID=HP010000671033&C
TT=3&Origin=HP052516521033
I hope the information helps. Have a nice day!
Sincerely,
Arnold Gao
Microsoft Partner Online Support
Get Secure! -
www.microsoft.com/security
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