Adobe Acrobat 7 Professional - Manual (Page 173)

Saving document changes
If the document properties allow, you can save your changes to the current Adobe PDF
document. Otherwise, you can save your changes to a new PDF file.
To save changes to a PDF document:
Do one of the following:
●
To save the changes to the current document, choose File > Save.
●
To save the modified document to a new file, choose File > Save As. For Save As Type
(Windows) or Format (Mac OS), choose Adobe PDF Files (*.pdf). Type a name and
location, and click Save.
To revert to the last saved version of the Adobe PDF file:
Choose File > Revert, and then click Revert.