The add-on works with the different planned versions of Office 2007, which is now in beta testing and expected to be made generally available by the end of the year.
According to the release notes of the download, people can save a document or send an e-mail attachment in PDF or XPS format.
Both formats are designed to keep layout consistent for viewing and printing.
The, announced last October, prompted in June.
In response, Microsoftand decided to offer the feature as a separate download rather than have it included within Office 2007.
Microsoft executives have said that Save as PDF was one of the features most requested by its Office customers.