Editing MAPI (section)

== Reimplementations ==
Several [[open-source software project]]s have started working on implementing MAPI libraries, including:

* Grommunio/Gromox has C++20 implementations of MAPI/RPC and MAPI/HTTP servers.
* The OpenMapi project (now demised)<ref>openmapi.org used to host the downloads; it no longer exists</ref> had a C# implementation.
* [[Kopano (software)|Kopano]] Groupware Core has a C++2011 implementation called "mapi4linux" (continuation of the same from [[Zarafa (software)|Zarafa]]), which offers an API that is source-backwards-compatible with the Messaging API (code written for M4L also build with the Windows SDK). Kopano GWC comes with a connector for the Zarafa/Kopano-based SOAP/HTTP transport.
* [[OpenChange]] has a "libmapi" component written in C that only partially resembles MAPI. (Lacks interfaces like IMsgStore, the OpenEntry function.)
* The OpenChange subproject [[Evolution-MAPI]] is a connector for Exchange implementing the MAPI/RPC transport.
* The GNOME [[Evolution (software)|Evolution project]] develops ''evolution-ews'', which has implemented much of MAPI.<ref>{{cite web |title=EWS Operations Features' Parity Matrix |url=https://wiki.gnome.org/Apps/Evolution/EWS_OperationsFeaturesParityMatrix |access-date=17 December 2018}}</ref>