When you pass on Outlook Anywhere on a PC that is running Exchange 2007 that has the Client Access server part acquainted that will give access with Exchange 2003 or Exchange 2003 SP1 or a later shape, you ought to organize those servers by using the setup wanders for RPC over HTTP for those adjustments of Exchange.
Introduce a substantial Secure Sockets Layer (SSL) testament from a confirmation specialist (CA) that is trusted by the working arrangement of the customer PC.
Introduce the Windows RPC over HTTP Proxy segment.
Run the Enable Outlook Anywhere Wizard on no less than one Client Access server in your Exchange sending.
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On the off chance that you have not as of now empowered an Exchange 2003 server for RPC over HTTP get to, utilize the Exchange System Manager RPC over HTTP UI in Exchange 2003 to empower it.
On the Client Access server, sign on by utilizing the Exchange director record, and after that begin Registry Editor (regedit).
In Registry Editor, find the accompanying registry key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeServiceHost\RpcHttpConfigurator\
Right-tap the PeriodicPollingMinutes DWORD esteem, and afterward click Modify.
In Edit DWORD Value, in the Value Data box, enter 0.
Snap OK to spare your progressions.