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Does this checkbox mean that MAPI-based RPC data will be encrypted and then encapsulated over HTTPS, resulting in double encryption?

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I'm asking this question based on this understanding of terms.

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up vote 1 down vote accepted

The MAPI encryption that is enabled by default is between your Exchange servers and Outlook, within your LAN. Outlook Anywhere uses https over the Internet. I would not use http over the Internet, but internally there might be some benefits (eg with older clients).

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