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If they're not going to put the energy into keeping their computers up to date then don't make it so damn difficult for people to build their own or install the OS X on other systems.
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Apple will not release a Mac OS X version for non-Apple branded machines. It didn't work well in the 90s why should it now? Just because more users are aware of Mac OS X and want it?
Back to the topic:
I work at two editing companies, one has a complete Windows environment, the other uses Mac OS X for its editing computers.
Both companies use Avid Media Composer, and I always have the feeling, that it takes me longer to finish a simple task (capturing a tape) on Windows than on Mac OS X.
The only advantage to the company using Windows as their environment is that they have a Unity system, which works better in networked environments than EditShare does, the solution being used with the ac OS X environment.
The company using Mac OS X has projects of up to 1300 video tapes (Digi Betacam and DV) with lots and lots of multi-cam groups (I must have made 5000 or more groups in the last year or so), and the project comes to a halt (it's 600MB in size) via the EditShare environment. That is the only disadvantage of the Mac OS X company I found til today, but that is even platform independent, as Unity and EditShare can be used with Windows AND Mac OS X.
What it all comes down too, is personal preference. And cost.
A friend of mine wrote her diploma thesis about the editing environment of a multi-national broadcast network, and came to the conclusion, that replacing the entire Avid environment running on Windows (30 or more editing PCs at the headquarters) with Mac Pros and iMacs using Final Cut Pro, including server storage of up to several tens of TBs, and including the re-education of their editors using Final Cut instead of Avid, would be several times cheaper than staying and upgrading the Avid system over time.