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Useful technical links - MAPI


If using Exchange Server then you should consult the available logs. Outlook cannot connect to the Exchange Server by using MAPI over HTTP when a proxy is enabled that has your own domain listed as an exception.

Microsoft Exchange: Test MAPI connectivity of user mailbox

MAPI solutions do not work because Outlook.exe is not properly registered under the \App Paths key in the Registry

How to allow MAPI to load unregistered Provider DLLs

Outlook 2010, 2013, 2016, or Outlook for Office 365 may not connect using MAPI over HTTPs as expected

How to configure Outlook as your MAPI provider

How to allow MAPI to load unregistered Provider DLLs

While not our program this indicates an issue in Outlook -
Error: "This MAPI provider DLL might be harmful to your system" When Sending Emails in Outlook Versions 2016 & 2019 with Kerio Connect Version 9.2.9

Unable to send MAPI Email with 64 bit Microsoft Outlook


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