Cannot start Microsoft Exchange RPC Client Access service - Exchange 2010 Beta

Issue:

If you have installed both Client Access Server (CAS) role and Mailbox role (Exchange 2010 beta) at same server, Microaoft Exchange RPC Client Access service cannot be started. Therefore Outlook mapi clients (Outlook) won't be able to access their mailboxes unless you enable Outlook anywahere (http over RPC when you configure your Outlook Clients)

Cause:

For Exchange 2010, Microsoft instroduces Microsoft Exchange RPC Client Access service on CAS server role to respond Mapi clients, such as Outlook's requests to access mailboxes on Exchange 2010 server. The issue will be fixed in Exchange 2010 later build.

Workaround:

You may copy and paste the following txt to textpad and save it as *.reg file to fix the issue:

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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem]
"Mapi Rpc Endpoint Registration"=dword:00000002

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeRPC\ParametersSystem]
"ExecutionFlags"=dword:00000002