May I use NAV2009 subscription for NAV2010 (now is beta) ?

I've just download the NAV2010Beta version and it didn't accept my old subscription. I tried to fill the serial.. but it says wrong key..

 

My subscription'll be able to use in 2010 version? Have i to upgrade key? It's has about 350days remaining...(Nav2009).

 

Plz..help me..