Tags/Labels in the Message List:

I find Gmail's color coded Labels extremely useful for organizing and filtering my mail, and its something I would appreciate in Outlook. I know Outlook allows tagging via Categories but this feature has two major limitations:
1) You can specify only one category to each mail, unlike Gmail in which a mail can have multiple labels.
2) The visual presentation of labels (color coding, label display location) is much better.

I would like to see a similar feature in Outlook, whereby we can add multiple color coded custom "tags" to each mail and which can also be usable with filters and for searching through mail.
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Annotations/Comments in the Message View:

The ability to add short notes to each mail in the Message View would be very useful. I often find myself copying an email into onenote just to be able to add notes to the mail and collect information needed for sending a reply, often I will compose the message over there and then copy-paste it into the mail window. A note or comment feature within outlook would be very useful for this.

Being restricted to 5 email addresses for a personal domain in outlook.com Premium (when available outside the US) is too limiting.

We have a personal domain setup for the family, and currently use 7 accounts for the family members including a few aliases for shortened first names/nick names - and this is just two generations without partners.

As the family grows, it is easy to see many families having between 10 and 15 members (parents, family, partners, grand-children), or even more, wanting to use the same domain (as they all share the same surname).

There needs to be a way to have more than the 5 limit on addresses in a single domain within outlook.com premium, potentially through adding on packs of 5 for a small additional fee.

Alternatively, the features that worked absolutely fine on the old platform of having personal email addresses as primary account names, send-only accounts with the same name as the primary (and not getting sent mail going out incorrectly with "on behalf of") need to be made to work again, reliably and simply on the new platform - including the ability to connect to accounts in this form from Outlook 2016.

Personally, I would not mind a *small* charge to allow these types of configuration, maybe through a small premium style fee (no advertising, etc.).

Remove Message number count from Junk Mail. I would like it if it only showed a number count for how many new messages you have instead of a number count for all messages that you have. It isn't important to me to know how many messages I have in the folder, but if there are new messages. I noticed this when I set up Office 2011 for mac, and I thought it was a glitch in the software, until I signed in on the web. That is when I saw the entire folder message count was shown. I have used Entourage 2008 for mac, and I love the simplicity of only showing new message count on folder list. Why can't you just show when there are new messages instead of counting how many messages are in the folder. That would be greatly appreciated if you could change the number count to only show how man new messages you have in the folder, instead of how many messages are in the folder.

In the Apps menu (the one with the tiles), Calendar, Powerpoint and OneNote names show up in two lines and it doesn't too good. Comparing the new menu with the old one I see that Powerpoint and OneNote were already two lines before but Calendar was not; it became two lines now because it says "Outlook Calendar" which is arguably too much.

The order of the icons has also changed. The order used to be "Mail, People, Calendar" and it is now "Mail, Calendar, People". Muscle memory makes me click on 'Outlook People' when I wanted to click on 'Outlook Calendar', perhaps we should considering keeping the same order as before.

The new list is also missing a tile for the generic "Office Online".

Since Tasks is a lot more related to calendar I would suggest moving it before OneDrive, although that can play against muscle memory of OneDrive being the 4th tile.