A feature called "sync" allows downloading emails locally on a per-folder basis. That will allow accessing them while offline, keep them always up to date, provide faster search, show unread email count and show push notifications as soon as new messages in those folders pop up.
Microsoft Outlook comes with quick swipe features where users can quickly swipe the thread either from left (to schedule) or right (to delete or archive). Additionally, users can also customize the swipe actions to, for example, set swipe from left to archive or swipe from right to delete.
The app stores user information and credentials on outside servers which is a violation of ActiveSync password requirement policies. These security concerns have been enough of an issue that European Parliament has banned its members from using the app out of fear that it might lead to leaking sens...
Color coding allows for users to set up custom visual ques as to what the notification is for, which makes for a convenient way to glance at ones device to know if the e-mail is something they want to open.
You'll easily find the email you're looking for since it organizes your messages in clusters. Meaning, it combines all the emails from the same sender since a lot of emails come from regular or the same senders.
Aggregates your email from all of your different email providers. Allows reading and managing your Exchange, Gmail, iCloud, etc emails all in one place. There's support for both unified inboxes and separate inboxes for each account.
Type Mail has clearly put effort in to make their interface easy on the eyes by following Material Design style guidelines and easy to overview by color-coding messages and including details such as service logos and sender's profile to quickly understand where the message is coming from.