Can I install Internet Security 2010 instead of 2009 with my 2009 license?

I purchased IS 2009 a few weeks ago, and did not get around to installing it.  I have since upgraded to Windows 7. I think I have read some discussion here that said I should be able to download IS 2010 and activate it with my 2009 license for a year, but I wasn’t sure if I was reading it correctly.   Is that true?