You can copy and paste MS Word, RTF and other formatted text directly into all modules except HTML Designer and Newsletter. While you can also copy and paste formatted text into these modules, the font formatting used by your word processor will also be pasted. Word processor format codes are not intended for the Web. So your formatting will not be consistent for all visitors.
To copy and paste word processor content into HTML Content Editor or Newsletter, experiment with the various pasting tools found on the toolbar: Paste, Paste from Word, Past from Word cleaning Fonts and Sizes, Paste Plain Text and Paste HTML. The best practices is to Paste Plain Text, then format your content.
If content is pasted that appears distorted, then try using the Format Stripper.