The process of creating PDF files from an Office 2007 document/file has changed with this version. You can still create PDF files from any of the applications (Access, Excel, PowerPoint or Word), but the process you follow and any special options available to you when creating PDF files from within Office 2007 applications will depend heavily on the version of Adobe Acrobat you have installed (if any):
Note: It is not necessary to download and install the free Save As PDF plug-in available from Microsoft for Office 2007 if you have any version of Adobe Acrobat installed.
Acrobat 7 or Earlier:
If you have installed Office 2007, and you have an Acrobat version prior to Adobe Acrobat 8 Professional installed as well, you will not have the additional Adobe PDFMaker (a special macro with added powerful options) add-in capabilities available from within the Office 2007 applications.
You can still create PDF files from any Office 2007 application using your earlier Acrobat version - simply Print the file to the Adobe PDF print driver:
Acrobat 8 or later:
If you have installed Office 2007, and you also have installed Adobe Acrobat 8 you will not have the Acrobat tab on the Office Ribbon which makes additional PDF creation options available from within Office 2007 applications until you have updated your Acrobat 8 version.
You must install a free update patch from Adobe to update Acrobat 8 Professional to version 8.1.0 or higher.
If you have version 8.1.0 or later installed, you can open any Office 2007 application, then click the Acrobat tab on the Office Ribbon to access options for creating and working with PDF files from within that application.

The Office Ribbon with the Added Acrobat Tab
Microsoft has the free Save As PDF add-in for Office 2007 that allows you to create PDF files from any Office 2007 application:
You can also install and use the Save As PDF add-in if you have Adobe Acrobat Standard or Professional installed on your computer; however, you will have greater control over the PDF file created if you use the Print method outlined above.
More information about compatibility issues between Office 2007 and Adobe Acrobat Standard and Professional is available from Adobe at http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=333670