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Dbl-clicking the OmniOutliner Exports Plugin zip archive file will decompress its contents - generating a folder called Exports plugin which contains instructions and a subfolder (Exports Plugin.ooxsl) which you need to move to HOME/Library/Application Support/OmniOutliner 3/Plug-Ins/

As long are you are running OO3 Professional, Microsoft Excel (XML) will then be one of the file formats available under File > Export


Last edited by RobTrew; 2010-09-23 at 12:55 AM.. Reason: Clarification in case unzipping is unfamiliar