"Firefox is a stand-alone browser, but the Mozilla Foundation is
developing messaging and calendaring applications that can be used
with Firefox. eWEEK Labs' ongoing tests of the Thunderbird
messaging client and Mozilla Calendar extension show that these
applications are shaping up to provide healthy competition in their
"Thunderbird and Mozilla Calendar are still in beta, and both
were updated earlier this month. Like Firefox, these applications
are free and open-source..."
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