Outlook 2003 Cached Mode

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O2Flow

Limp Gawd
Joined
Jul 8, 2004
Messages
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Looking for anyone who has experience running an Exchange 2003 server with clients using cached mode over a large switched network with multiple remote sites.

Questions:
What are the performance impact on the client side?
Have you encountered any GAL problems?


Any input would be appreciated.
 
dont use it unless the user is on a laptop that they take off of the network. it will start to cause major issues with connectivity and and sending messages, updating calendars etc....some of the issues will be instant others will take time.

we have over 15,000 employees on our network this has always been one of the things we keep having to tell the installers to disable when setting up or upgrading workstations.
 
It also does funny things like copying the Inbox over, but not any of the other folders the user may have. It also limits the number of machines that user can read their email at to just that one. Unless they are dedicated laptop uses, just leave the email on the Exchange server, or use a standard PST file on a network share.
 
IMHO, you *should* be using cached mode since it will reduce the bandwidth consumption on WAN connections.

One downside to disabling caching is that the user will not be able to open or access outlook if Exchange server is down.

Read the following MSKB for additional details.
 
We use cached mode for office locations who are on 56k frame to our corporate, but for sites on point to point T1s and other high speed connections we do not have it turned on, because as the first reply mentioned there are side effects that will pop up from time to time and cause uneeded troubleshooting. Cached mode was intended for mobile users first and foremost.

For Outlooks built in Junk Mail filtering, you will find cache mode does have to be enabled. So for users wanting this feature it is a must. We have found most people do. It catches stuff our Spamassassin and other serverside filtering does not.
 
You mentioned remote sites, so cached mode is a must if not it will be a huge hit on your bandwith.

But when first setting up outlook for users on remote sites, it will take a little longer as outlook will be caching its first copy of pst on the local disk.
 
Thanks for the input everyone, I wanted to stress that only remote sites will have this enabled, and we obviously are doing this to reduce bandwidth over the WAN.
 
good luck. just a tip if users are not able to send emails anymore from local machines disable it on there boxes. you will learn real quick about that.
 
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