Some ways to improve OWA over dial-up
Sometimes customers see slow performance when accessing OWA over Dial-up and using SSL. Here are some things that you should check to make sure that you are getting the best performance.
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If it is, you might consider (in order of cost) a card that can offload the SSL load, upgrading your CPU, or load balancing with another FE. The SSL card makes the most sense in almost all scenarios.
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The following options is not recommending that you turn off SSL!!! It just is pointing out that you can offload the SSL to a server infront of the FE servers in a DMZ. You can have the Exchange server in a DMZ with no outside access and a ISA server in front of it set to allow Anonymous connections:
Location: HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Rpc \ RpcProxy \
Parameter: AllowAnonymous
Data type: REG_DWORD
value = 1
Then you could offload the first connection (SSL) to an ISA server or a third party SSL accelerator.
