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Remember Java? 100% cross-platform Java?

Good Lord, dude;

Java on the client was slow (and still is)
Java on the server is great! Unfortunately, too many vendors needed to "add value" and ruin the cross-platform capabilties.

Write once, run anywhere was a pipe dream.

This however might not be - We'll have to see when they add data capabilities to the stack.
 
It's not just a player, it's a platform. That's pretty powerful if you think about it. It's a mini CLR

What would really be funny - if now, someone created a new online office suite using these tools! Wouldn't that be ironic ?! :)
 
If it can't be authored on a mac, the long term prospects of the player staying cross platform and fully featured are slim.

It can be authored anywhere. At the end of the day, you're just dealing with XAML files, which are pure XML, and Javascript, Ruby, Python, VB, or C# files, which are just text files. Sure, you don't get any of the nice hand holding you'd expect out of an IDE, but meh.

I could author a Silverlight app on the Mac with vi or emacs, if I wanted to (although I'd rather use TextMate :) )
 
The real question is...how long until they abandon the Mac client like with WMP. My vote is for Adobe and their Flash player. They have no OS agenda like MS.

That and look at the platforms they support:
http://www.adobe.com/products/flash/about/

Even my mobile phone has Flash on it. Unless MS is going to write a client for all platforms, they should save their money and let Adobe have the market. We all know how this will play out, MS is going to bundle it with their OS and then get sued again.
 
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