Are there other differences between the free and paid versions?

The answer in faq to this question is so terse as to be useless. So, could you please elaborate on the differerences in features between the free and paid versions?

Paid version (Pro) allows for more than 2 email addresses to be used. I think.

plus it removes the eM client signature from the bottom of your mails. This is only applicable after your trial period has expired ?