Here are two quicker methods to copy-paste formatted text as unformatted text in Microsoft Office Outlook or Word.
1. After pasting text, highlight that text and press Ctrl + Space to remove all font and style formatting (Office 2003, 2010 and 2013 confirmed).
2. Alternatively, paste the text using Ctrl + Alt + V and choose Unformatted Unicode Text which “Inserts the contents of the Clipboard as text without any formatting” (Office 2010 and 2013 confirmed).