Under Paste Special, is there an Unformatted Text option? Usually there is. For my purposes, I use that option more than any other because it doesn't attempt to give me all of the formatting stuff with it (the font size, paragraph style, etc., etc.). Go into reveal code some time and look at all of the stuff that Rich Text Format brings in. It's great if that's what you intended, but when I'm cutting and pasting text, I generally simply want to move the text, not all of the rest of that.
If you paste it as Microsoft Word Document, it brings it in as a user box with an embedded Microsoft Word object. It gets treated in much the same way a graphic would be. You can edit the text you bring over, but you have to double-click on it. It then opens up a small Microsoft Word window to allow you to edit it. It doesn't however, just become part of the text in your document with that option. BlackburnKL