Don't automatically cluster emails from certain days together.
If people want to sort emails or see when they were sent, there are still dates displayed. Adding divisions into meaningless groups just clutters up the look of the inbox.

First off, thank you for using Outlook.com and for taking the time to provide feedback!
I just wanted to take a minute and let you know that we have added a setting to disable/enable the Date settings.
To turn it off do the following steps:
1) Click on the Gear in the top right
2) Turn off the toggle for Group messages by Date
Thanks! And keep the feedback coming!
David Los