The versions are totally seperate, so they will coexist peacefully.  However, you will need to install the latest Service Releases and Content updates for each if you have reinstalled them from scratch...

http://my.smithmicro.com/poser-pro-2010-updates.html

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The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
"The [R'osity Forum Search] 'Default' label should actually say 'Don't Find What I'm Looking For'".
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