Sending, receiving, and organizing email in Outlook.com
@Phyllis Weltz said
Sync issue to phone….iPad How to get rid of old folders and mail
If the AI Answer suggestions didn't help, can I please have some more details on your problem:
1 -- If you access your account using Outlook Web https://outlook.cloud.microsoft/ can you remove the old folders and mail?
2 -- If you then go to Outlook on your iPhone or iPad, have the changes been synced to your phone? If not, see
https://support.microsoft.com/en-us/outlook/install-mobile/troubleshoot-outlook-mobile-issues
If you still need help, please leave a comment to this Answer with some additional details and any error messages you are seeing.