Hi @BRADLEY, Ian (FRIMLEY HEALTH NHS FOUNDATION TRUST)
Welcome to Microsoft Q&A Forum. Thank you for reaching out and raising this accessibility concern.
After reviewing documentation and testing, it’s confirmed that in the New Outlook, the option to change the background color while composing an email has been removed. While changing the Outlook theme color is still available, this does not affect the background color of individual emails. This change has caused frustration, especially for users who rely on visual adjustments for accessibility or neurodivergent-friendly communication.
At this time, there’s no confirmed timeline for its return in New Outlook. However, accessibility and user experience are priorities, and feedback like yours is vital to ensuring those needs are addressed. I strongly encourage you to share your feedback through Help > Feedback in the Outlook app or by visiting Microsoft Feedback Portal.
While we await official updates, using Classic Outlook remains the most effective workaround to retain this functionality.
Your feedback is sincerely appreciated and plays an important role in guiding future improvements. Thank you for your patience and continued advocacy for accessibility.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.