We're considering encryption email. We have Exchange 2010. Our clients use Outlook 2010, 2013, Outlook for the Mac, Apple Mail.
We also have mail on a mix of Apple and Android phones. We have a large group of users that use Outlook Web Access.
Based on this information. Are there any things we should be aware of before looking at different options?
I assume the best way is to manage this at a server level?