Previous Systems folder after reinstall

[Otto]

Having grown weary of restarting my computer every twelve minutes following an upgrade to Mac 10.4.8 I reinstalled version 10.4.6. As part of the process I ended up with a folder entitled Previous Systems. Can I get rid of it without doing anything else or extracting anything from it?

[Arnold Winkelried]

http://docs.info.apple.com/article.html?artnum=301270
You might wonder, "What do I do with the Previous System folder?" It may contain items that you need. To determine this, once you've finished configuring, installing, and updating your applications, compare the Previous System to the new System. If there are things in the Previous System folder that aren't in the new System folder, just copy them over. If you're not sure what some items are (and don't seem to need them), leave them in the Previous System folder. Once you're comfortable that you've got everything you need out of it, you can delete the Previous System folder (or leave it around if you're not low on disk space).