[ubuntu] is there any way to install both open office and libre office?

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http://ubuntuforums.org – i recently installed Ubuntu 11.10 which of course comes with libre office. I'm used to excel 2010 (and lots of conditional formatting options) and i thought libre office was great for everything I'd ever have to do except for the conditional formatting.. so i thought I'd try open office to see if it had any more options, but after downloading it (not from the repository, after reading the reviews), i couldn't figure out how to install it. on googleing it, every thing i see says something like, "step one, uninstall libre office" which I'm not really eager to do, because i already ha (Hardware)