It ain't Thunderbird's big feature but it's an important one at least for me. The fact that pgp is not growing in popularity is not related to its security but

It ain't Thunderbird's big feature but it's an important one at least for me. The fact that pgp is not growing in popularity is not related to its security but its difficulty of using it properly (and the fact that it is an open and non monetizable solution). Having been integrated in the Thunderbird as a first class feature makes it very easy to use so it may lead to increase in its popularity! I have no experience with OME but I presume it's a proprietary solution.