For more on this, check this take on the 2011 version of the NIV:
http://trevinwax.com/2010/11/16/the-...rces-a-choice/
I bet if you also had TNIV, you probably can't download it if you delete it as the 2011 NIV replaces 1984 NIV and TNIV.
I bet Zondervan did this because lots of people including myself are starting to read The Message. (I have the REMIX version....quite good).