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infp - 3:44 pm on Jun 15, 2008 (gmt 0)
If an existing user is forced to remove FF2 first (or to install FF3 next to FF2), it is still an update from version 2 to 3. The internal technical details are not important. It is still just an update (like XP SP2 to SP3).
I don't believe updates count. I remember reading that only downloads will be counted and updates to the new version will not. So if you are planning on taking park I guess you have to uninstall the current one first, pretty lame..