Can I delete LR2 after upgrading to LR4?

I just upgraded from LR2.7 to LR4.2.     LR2.7  is still on my computer....  The upgrade transferred my old presets OK. So, can I delete LR2.7 without any problems?
Ed in Florida

Yes, you can uninstall older versions of LR. The LR upgrades (and updates) are complete programs - they don't need the older versions to run.
P.S. Even if you want to fall back to the old process version of LR 2.x, LR 4.x still does support them (menu settings -> process ->... or at "camera calibration" pane).

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