Office 2007: Microsoft Save as PDF or XPS
Microsoft’s free Save as PDF or XPS converter lets Office 2007 save documents in either format. It is easy to install and removes the need for an additional PDF printer or converter.

Download SaveAsPDFandXPS.exe from Microsoft.

Run SaveAsPDFandXPS.exe, accept the Software Terms and click Continue.


Click the Office button, select Save As and choose PDF or XPS.

That is all, and it is free. If you put SaveAsPDFandXPS.exe in the installation folder named "Updates", it will be installed automatically as part of the installation routine. As far as I remember, Microsoft was not allowed to include it by default, so users have to download the binaries from the internet first.
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It will not install automatically if you put it in the "Updates" folder, that folder will only work for *.MSP files.