One day you get sudden trouble: the copied Excel table or table portion cannot be pasted into Outlook mail message or Winword document. Only plain text contents appear instead.
Do not search for “hidden” Excel or Office settings. The reason is surprising Skype Click to Tel Add-On
Go to Program and Features (aka Add/Remove Software) and remove the AddOn – the easiest way to get rid of this effect and enjoy!
UPD: see also http://smoothspan.wordpress.com/2012/03/24/omg-skype-click-to-call-breaks-excel-so-it-can-only-paste-text/
