Hello,
Thank you for reaching out with your question about managing identities in Outlook for Android I understand how important it is for your team to maintain flexibility when replying from specific email addresses while keeping devices optimized for performance. Unfortunately Outlook for Android does not currently support removing an account while still using its address as a reply-from identity. This limitation exists because the app requires the account to remain configured in order to send messages from that address.
As an alternative you can keep the primary mailbox active but disable sync for emails and calendar to reduce the load on the device. This way the account remains available for sending replies without overwhelming the phone with incoming data. Another option is to explore email clients that offer more advanced identity management features if this functionality is critical to your workflow.
Would you like guidance on how to disable sync for the primary account in Outlook for Android?
I hope this answer is helpful if you have further questions feel free to reply back
Regards,
Marcelo