Please add a delete button at the bottom of the full email view page instead of top right. Is hard to reach with one hand use.

Sort by sender, date, subject, size...

Should have the ability to tap on a number in the contacts to make a call. Also if a call is received from a person in the contacts their name should appear not just their number.

Have the ability to go full screen in landscape mode without the list of messages. Especially useful on iPhone 6 Plus and iPad.

Option to turn off contacts sync when you have multiple email providers. Without this option you get lots of duplicate entries in your contacts in outlook. At present lack of this facility stopping me using this app,

It would be helpful to see the unread message count for each separate account on the accounts menu in mail view.

Allow users to only sync selectively from an account (ie, ONLY Mail, Only Calendar, ONLY Contacts, ONLY Google Drive and not email...) as opposed to having to sync mail, calendar, contacts as a whole.

Allow users to only sync some folders.

We can view scheduled Wunderlist tasks now, but it would be great if we could check theses off as completed from within Outlook, a la Google Reminders in Google Calendar.

Smart search folder that will show all unread emails from all folders, the same as in outlook for desktop. This feature will be perfect to use with exchange rules.

Add time zones to calendar and meeting invites

To move messages to different folders or to peek a message.

e.g Mark as Read From Notification area without opening Outlook.

Ability to select and add multiple attachments rather than one at a time

It would be nice to be able to control what types of items create notification banners/alerts. For example I only want to see calendar reminders but not an alert for new emails.

I would really like to be able to move my emails from one account folder to another. Currently i can only move an email between folders within the same account. For the people who have multiple accounts linked to the phone is pretty handy. This feature is supported in Apple's mail app.

Some spam filters create false positives. Create a feature to mark email from a sender or the sender's domain as Not Spam so thereafter it lands in the Inbox instead of Bulk Mail.

If a user has 5 alias on their outlook.com account. They should be able to send from any one of these on their iPhone. Currently you can only send from your Primary email.