please do not try to combine emails, emails should not combine any differently in this app then they do for normal email.
emails should not be combined!

Hi there,
Thank you for using Outlook Mobile and sharing your ideas with us. We really appreciate your support.
Conversation or Thread view can be disabled in our app. To do so, please go to your App Settings page, scroll down to Organize Mail by Thread then toggle it OFF.
Should you need further assistance with this feature, please contact us through the Help Section of your app which you can find in the in the Settings > Help and Feedback > Contact Support and we’ll be happy to assist you from there.
Thank you again for your support, we look forward to hearing more of your ideas very soon.
All the best
The Outlook Mobile Team
PS: Please use the Help Section of the app for any questions, we are not able to see replies to this address.