Date selection for OOO should be their in Automatic replies setting.

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

Search calendar for particular entry

Add time zones to calendar and meeting invites

Currently Outlook will only show iCloud calendars available on iCloud.com. It does not display subscribed calendars (such as work calendars, school calendars, etc), even if they are synced via iCloud to Macs, iOS devices, etc. The native iOS calendar app DOES show these calendars, as do other 3rd party calendar apps such as Fantastical. Please fix this.

Currently it does not seem possible to remove events that have been cancelled by the meeting host. The update arrives in the mailbox but does not have an option to delete from calendar.

Being able to set up multiple "alerts" for a event/appt, etc. instead of just one on the calendar

I put an event on the wrong calendar and can't move it.

I want to be able to view and edit Gmail and iCloud calendars in Outlook.

Add travel time to appointments and meetings.

I need to be able to quickly duplicate events by copy/pasting them (for things I do frequently, although not in a fixed recurring schedule).

This functionality is found in other apps like Calendars 5, and it makes it a breeze to add appointments and rearrange my agenda!

Ps. although I love Calendars 5 and will keep using it as my calendar app, I would switch to Outlook in a heartbeat if you can match its ease of use, because I love the idea of having all my calendars, emails and contacts in one app!!!

All Day takes up too much visual real estate especially since most people don't have all day events. It should either be optional or take up a lot less room. Or show up only if there is an all day event

Dial conference calls with 1 touch.

Add the ability to set a default reminder notification instead of "none".

I have numerous different Google calendars and each have their own specific notifications, such as 2 hours before for "work calendar" but 1 day before before for "band calendar." Instead of having to re-type all my default notification times once I brought them in to Outlook, it would be nice to have them sync !

Integrate with Trello. Currently Trello calendars also don't work properly with outlook