The OpenMapi.org Java library (still unreleased) can be used to build Android apps that directly connect to the OpenMapi.org Proxy server and, from there, to any NMapi supported backend or MAPI provider.

The screenshot shows a little example app (that really just prints the directory structure of the MAPI store it is connected to to the screen) running in the Android emulator.

Some parts of NMapi just landed in svn. The module includes the proxy
as well as the teamXchange backend. Some interesting things have been
removed (like proxy modules, some providers, the gateways and tools) and
will hopefully follow in the next days/weeks.

Get it from svn:

Or browse it with WebSvn.

The code currently might or might not build on Linux with the latest

Zarafa, which is part of the OpenMapi.org initiative, has just released
its core products as Open Source. OpenMapi.org is working on a backend
for its NMapi library to support connecting to Zarafa Mapi server,
providing a complete open source software stack for OpenMapi.org
clients.

For more information, please see the press release:

18 Sept. Number one Exchange replacement Zarafa releases software Open Source

OpenMapi.org is online.

Some documentation and some code samples are already available. We will release further components soon, starting with the Proxy Server and NMapi.

OpenMapi.org is an effort supported by Wilken (Ulm), VIPcom GmbH (München), Zarafa (Delft) and Topalis AG (Stuttgart) to provide an open groupware API based on MAPI that supports a variety of backends (servers) and can be used to develop clients in many programming languages and on different operating systems.

OpenMapi.org is a set of libraries (for C#, Java PHP and Python) that implement a simple but powerful API to connect to different groupware servers. Additionally we also develop a modular open mapi proxy server that provides common features like logging, load-balancing, etc.

For Developers of groupware-clients OpenMapi.org makes it possible to develop clients that can connect to different backend servers.