ZDNet UK: Open-Xchange Offers Free Trial

“Open-Xchange is making its commercial features available as a
free trial, as part of a drive to get more users onto the open
source Microsoft Exchange competitor.

“Open-Xchange Server 5, released last year, is licensed under
the GNU General Public License, and a free version is available for
download. But many of the server’s advanced functions come from
proprietary extensions, called OXtenders, which must still be
purchased, the company says…”

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