Configuring preferences and options in Outlook.com
Hi Joe,
Thank you for posting the query on Microsoft Community.
I understand that you might be facing some issues with Outlook Mail Preview. But we are trying to provide the best possible and easy to access web emails experience. You can provide feedback about by clicking on Gear Icon in your updated account so that development team will consider your feedback.
It is not possible to roll back to older one.
Frequently Asked Questions for Outlook.com Preview:
In future, if you have any issues related to Outlook.com, do get back to us. We will be happy to assist you.