Outlook Connectivity with MAPI over HTTP | Microsoft Community Hub MAPI HTTP increases the CPU load in the Exchange Client Access Servers This is a 50% increase over Exchange 2013 RTM, however it is still lower than Exchange 2010 requirements As you plan be mindful that deploying in a multi-role configuration will minimize the impact to your sizing
Planning considerations for REST-based (aka new model) calendar sharing . . . The REST Model The new calendar sharing model based on REST is designed to avoid MAPI issues related to conflicting permissions and multiple editing delegates This is one of the benefits of the new REST calendar sharing model and may be a reason to use the new model
Issue in SendOnBehalfTo | Microsoft Community Hub I Have a client having issue while trying to sendonbehalf email from Shared Mailbox which end user have SendOnBehalfTo permission When he select From
New Outlook: MAPI Exchange | Microsoft Community Hub I don't think microsoft will ever try to add mapi to it because mapi is a "client side" technology that whereas the new outlook is all server side (excluding the html css rendering)
Shared Mailbox Send As issues | Microsoft Community Hub Microsoft Exchange Data Storage SendAsDeniedException: Can't transport send message ---> Microsoft Mapi MapiExceptionSendAsDenied: MapiExceptionSendAsDenied: Unable to transport send message (hr=0x80070005, ec=1244)
Recommendation: Enabling Kerberos Authentication for MAPI Clients MAPI supports Kerberos authentication and the default setting in Outlook 2007 and later is to negotiate the strongest authentication available when not running in Outlook Anywhere mode In Exchange 2010, MAPI clients connect to load-balanced array of servers, and not an individual server with its own unique network identity