Using GPG Suite, can I communicate with people on Windows and Linux?

You installed and setup GPG Suite on your machine. But your friends use Windows or Linux?

Can you still safely communicate with them?

Yes you can, but they need an OpenPGP plugin for their mail client.

The EFF has some fantastic tutorials on how to setup OpenPGP on Windows and Linux. We highly recommend thoroughly going through that material if you are on Windows or Linux.

Spread the word - we can all communicate securely

If you have friends who do not yet have an OpenPGP key, why not ask them to create one? Offering help with the initial setup can work wonders and resolve initial hesitance.