I bought a QuickTime Pro 7 license in 2006 (yes I actually did pony up the 30 bucks) so I could get some additional functionality out of the software. I recently found out that the version is now up to 7.5 so I downloaded the upgrade. The notice shown on install would make it appear as if your license is no longer valid after you install this.

Not true.

Your 7 license will “carry over” if you already have it in there. I installed it and everything was a-okay. This is a significant improvement over previous versions where the install software would REMOVE your key and you had to re-enter in manually.

We’re it up to me I would do everything in DivX AVI as I personally feel it’s a superior format (heck, there’s even Linux support for it) to MOV. But Macs sometimes have difficultly playing those files even with (freely available) native support. And forget about trying to play WMVs on a Mac easily, so.. QuickTime it is for the time being and that’s why I use it.