MAPI over HTTP provides the ability for Messaging API (MAPI) clients and servers to communicate across a HTTP connection without using remote procedure calls (RPCs) The Problems with RPC Although RPC delivers significant advantages to application developers, it's an old mechanism that was originally designed to work across LANs rather than across the Internet.  This... Continue Reading →

Outlook is using GUID not Server name

Technical issues in exchange 2013 that we must know Outlook is using GUID not Server name Outlook clients no longer connect to a server FQDN as they have done in all previous versions of Exchange. Outlook uses Autodiscover to create a new connection point comprised of mailbox GUID, @ symbol, and the domain portion of... Continue Reading →

Outlook 2013 cannot connect to Exchange 2013 using MAPI over HTTP when proxy is enabled

Disable Mapi=1 Enable=0 Symptoms Consider the following scenario:You are using Microsoft Outlook 2013 version 15.0.4569.1506 or later. You are connecting to a Microsoft Exchange Server 2013 Service Pack 1 (SP1) mailbox using the MAPI over HTTP protocol. You have a proxy enabled on your Outlook client computer which has your own domain listed as an Exception.... Continue Reading →

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