I have some questions about Adobe Lightroom, RAW photo file format and DNG files.

First, I'll ask about software.

MacBook Pro (2.33 GHz, MacOS 10.6.8, 2 GB RAM, 500 GB HDD)
Will not be replacing this machine in the near-term, but it is a goal of mine.

I see Lightroom 4 is on Amazon for less than $120.

But would Lightroom run on my rig?