Upgrading to Xcode 2.3, do I need to uninstall 2.2.1 first?

Hello all,
Title pretty much says it all. I downloaded 2.3 (915 mb, woof!) and want to install it. Should I uninstall 2.2.1 first? Or is the installation system smart enough to do overlays and updates of individual files?
Long time Win32 dev, new to Mac dev, so forgive the ignorance.
Thanks,
Marc

Mac installer packages generally do a good job of upgrading any previous installation that might be present, provided they have been installed (rather than copied from another system) and no one has messed around with the /Library/Receipts packages. You might want to back up any projects you haven't already backed up in case they don't work after the new version updates them. If you install the WebObjects package, I recommend backing up your httpd.conf file first.

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