Microsoft gives blessing to an open-source calendar

Looking over yesterday's flurry of Microsoft-related announcements, I noticed that SpikeSource has Microsoft's blessing to service and support WebCalendar, an open-source calendar written in PHP, which SpikeSource now supports under Windows 2008. It's not clear whether SpikeSource also supports WebCalendar on Linux, but I suspect they do. It's a very small step forward, hardly swamp-draining, but it's something.