Installing Norton 2011 over Norton Internet Security 2010

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I have 15 days left on my subscription for NIS 2010 and the version of Norton Utilities that came with it.  I have purchased Norton 2011with Norton Utilities (discs and product keys in the box).  I have two questions:

  1. If I install Norton 2011 today, will I lose the final 15 days of the NIS 2010 subscription I paid for?  Or will the 15 days be added on to my one-year for Norton 2011?
  2. Can I install Norton 2011 over the top of NIS 2010, or do I have to uninstall NIS 2010 before installing Norton 2011?  Also, the same question for each year's Norton Utilities.

Thanks, Smitty.