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When you use Microsoft Outlook together with a Riverbed Steelhead WAN optimizer in a Microsoft Exchange Server 2010 environment, the Client Access server crashes. When this issue occurs, users cannot connect to the Exchange server. Additionally, one of the following events is logged many times in the Application log on the Client Access server:


This issue occurs because the MAPI cached mode accelerator in the Riverbed Steelhead WAN optimizer does not correctly accelerate the fast transfer copy command. Then, the Microsoft Exchange RPC Client Access service (Microsoft.Exchange.RpcClientAccess.Service.exe) crashes on the Client Access server.


To resolve this issue, enable MAPI skip-copy on client-side and server-side Riverbed Steelhead devices. To do this, enter the following commands at the system prompt: Steelhead > enable
Steelhead # config term
Steelhead (config) # protocol mapi skip-copy enable Note This command will disable acceleration for MAPI fast transfer copy commands without affecting other accelerators.

More Information

For more information about the RPC Client Access service, go to the following Microsoft website:

General information about RPC Client Access service

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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