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...to get a 2-1/2 year old AutoCAD 2011 license switched from a PC over to a Mac, or will I have to buy it again?
If you want to run AutoCAD 2011 on a Mac, you can do so through Parallels or Bootcamp. If you want "AutoCAD for Mac" (any version) you'll have to upgrade your old license to a serial number that works with Windows & Mac, or just buy it again.