Will it use the older PGP keys that I have been using or do I need to create new ones?

I have maybe one or two friends that use PGP actively, the rest either don't know how to use it or don't care. Will GPGP allow me to send encrypted messages that the older version of PGP will be able to read?

I have Outlook 2000, which I use for my email. I know I should use something better and Non-MS, but what? Outlook clicks with the Timex Datalink watch so well, and also can easily synch up with a Palm Pilot or Windows CE device. I'd need an Outlook replacement to do all of that.

Thanks for the info, bookmarked it, and will visit it later.