To convert your PowerPoint presentation to a PDF file, you will need to use the full version of Adobe Acrobat and not just the Acrobat Reader.

The advantages of converting a PowerPoint presentation into PDF (Portable Document Format) are the following:

Lighter file size

Final user does not need to have PowerPoint (though the free Acrobat Reader will be required)

Quality of display is guaranteed on all screen and monitor resolutions

Layout, fonts and colors used in your presentation are maintained

File can be seen on Mac, Linux, PC and other types of computers

Presentation can be encrypted, password protected, and numerous features can be placed under control (copy & paste of contents, printing, etc.)

To convert your PowerPoint presentation into an Adobe Acrobat PDF file, please follow these steps:

Open the PowerPoint file.

Select Print from the File menu.

Pull down the "printer" menu and choose Adobe PDF as your printer.Cick to enlarge

Set printing options, if needed. if you need to create a PDF of a presentation for handout purposes you may want to print out 4 or 6 pages per slide as to maximize usability and print costs. To do this you will need to select "Handouts" in the "Print What" pull-down menu, then choose the "Slide per page" option (all within the Print dialog box).Click to enlarge

Click OK. Acrobat will prompt you to give your file a name, and it will save it on your hard drive as a PDF file.

It's all done, just take into account that such operation may take a while, depending on the length and on the weight of your presentation.