How to open Micrsoft's so-called Open XML Format

[Anthony M Simonelli]

Just got an email today at work with an attached spreadsheet in
Microsoft Office Open XML Format Spreadsheet format.  I guess it's a
combination of XML and ZIP technology that they are pushing to make an
ISO standard document, claiming is is an "open" standard.  

I'm running Ubuntu at work and I believe Microsoft Office 2007 is the
only application that view these documents.  Is there a way to view it
with OpenOffice.org?
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