GNU Privacy Guard version 1.4.9 has been ported (12/29/2011) to OS/2; the latest version can be found here.
This can be used to encrypt data and to create digital signatures, is a
complete and free replacement for PGP, and is compliant with OpenPGP. A
popular use of this tool is with Enigmail and Thunderbird.
Source: OS/2 Warp News and Rumors