Ms Office Project I Am Currently Running Windows XP. If I Go To Windows7, Will I Have To Purchase New Copies Of MS Office, Etc?

I am currently running Windows XP. If I go to Windows7, will I have to purchase new copies of MS Office, etc? - ms office project

I am running Windows XP. If I install Windows7 (believe me, not me), I need new copies of MS Office, Project, Visio, buy, etc., so do they work? Or should I buy the upgrade? Or is it just to run OK. I read a little strange to have to download "XP mode? What Thanks all.!