OBM

OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.

Free
Open Source
Mac OS X
Windows
Linux

OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.

Links to official OBM sites

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Real time collaboration CalDAV

The Best 1 OBM Alternatives

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Atmail Email Server

Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.

Commercial Linux Web

File sync Group Mail

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OBM

Links to official OBM sites

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The Best 1 OBM Alternatives

Atmail Email Server

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