Improved Voiceover support
The app is for the most part accessible, but there are some aspects that could use some improvement. Entering email addresses in the to field when sending is difficult along with selecting to send from the shared mailbox account. Voiceover also announces quite often Outlook Web app which can interrupt with the reading and navigation experience.
With VoiceOver enabled the icons even after several application revisions are still inaccurate. For example a New Email says "Man's Head". The trash can is "Clock face 3o'clock". There is also no flick option for mark as read or delete from the mail folders. A few simple fixes would make the application more compliant.