Application Folder

The Dock is not an actual place where files reside in. It is a place to put aliases (shortcuts) to applications, files or folders.

MS Office will have installed its applications into the Applications folder already, it just put its icons into the Dock too.

To get them back there, drag them from the Applications folder onto the Dock, or start the applications and right click on the Dock icon and select "Keep ...".

To have aliases of applications on the Desktop, select the original in the Applications folder and press Command + L. Drag the resulting aliases onto the Desktop.


Also have a look at the following links to learn more about Mac OS X:

Mac OS X Basics

Helpful Information for Any Mac User by GGJstudios

"How to maximise your MacRumors troubleshooting experience" created by mad jew in 2006

MRoogle is a good tool to search these fora for already existing threads about questions you have. It might be able to answer you quicker than waiting for an answer.

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The answer above nails it. I'd just like to point out that your two questions combine to make a redundancy. If the apps are available in the Dock, you don't really need them on the Desktop. Of course, if you prefer to have both methods, go for it.