The only thing that matters is which email solutions comply with the new gov security mandate? We know EcrpytOne does and it integrates with 3rd party software well.
Think about this Libe wasn't going anywhere until Tom got involved and tweaked their software so it would meet government security requirements. Then all of a sudden they are making sales. Tom has a PHDs in laser and computer sciences. The guy knows his technology.
BVTK's development of secure communications software for LIBE JV ahead of schedule...
Someone gave a damn good answer to that question a couple weeks ago but don't ask me to hunt the post down. He responded to the exact questions you asked and you went silent!