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Office 2004 for Mac is a version of Microsoft Office developed for Mac OS X. It is equivalent to. 'Download Microsoft Office 2004 for Mac 11.6.6 Update'.
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As far as I recall it is impossible to run Office 2004 on a MacBook Air or any Mac running Yosemite. This is because Office 2004 was originally written for PowerPC based Macs and while Apple for a time provided a means for Intel based Macs to run old PowerPC software via a module called Rosetta this was discontinued many years ago when OS X 10.7 (Lion) was introduced. OS X 10.6.8 was the last version to include Rosetta.
The oldest version of Office for Mac you can run under Yosemite would be Office 2008, the current version is Office 2011, and very soon Office 2016 will be released. (Office 2016 is already available to Office365 subscribers.)
Note: A brand new MacBook Air cannot run 10.6.8 before you ask.
Your brand new MacBook Air will have come with free included copies of Apple's Pages, Numbers, and Keynote applications which respectively are Apple's equivalents to MS Word, MS Excel, and MS PowerPoint. Apple's programs can read and write to the same file formats i.e. .doc or .docx, .xls or .xlsx, etc.
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