Pegasus Mail. An organization I work with still use this software... because it's free. Its author [David Harris] has done a fantastic job of maintaining it bu

Pegasus Mail. An organization I work with still use this software... because it's free. Its author [David Harris] has done a fantastic job of maintaining it but the UI is definitely the product of a bygone era. I must confess to preferring Outlook 2016 and its ease of cross platform use when used with an Exchange server. I don't find the ribbon interface confusing like some on here. My only gripe is the complicated method of publishing recipients S/MIME certificates to the Global Address List before they can be used to encrypt mail with.