Upgrading and changing operating system

Hi,
I want to make a change to a Apple Mac in a few months. I also want to upgrade my Lightroom 2.7 to 3.0. What is the best I can do:
First upgrade Lightroom in my Windows systeem and then change my operating system.
First change operating system and then upgrade.
Can someone tell me which option is most save? I don't want the import of my image catalog to go wrong.
Thanks for your replies.
Regards,
Ron

Probably, simply check the supported models below:
Supported
Models
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
Xserve (Early 2009)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
and if you have one the these machines open the Mac App store and for $20.00 you can upgrade to Mountain Lion.

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