Plus de couleur

Color, fonts, bold, italic, ... for composing and replying.

Strikethrough font

Provide Contact pictures from exchange account, similar to outlook for desktop.

I use services such as gmail and outlook. But i cannot mark any emails as spam from Outlook which maps to the spam for gmail our outlook.com.

This is a must have feature which will make outlook complete.

Create, Edit and Delete Folders.
Auto-collapse folders in the side bar when the list is too long.
Arrange order of folders

View emails in full screen
Hide side panel (folder/email list)

I get many meetings requests ,however when i answer yes,it goes to the outlook calendar, not ios calendar ,which is not very good for me

Schedule emails to be delivered at future/specific date & time

Ability to schedule recurring meetings
Deleting a Single Occurence of a meeting deletes the entire series of meetings

1) Allow for categorizing email in Outlook on iOS.
2) Show categories assigned in desktop client.
3) Allow sorting by category in Outlook on iOS.