Using New Outlook on Windows for personal email, calendar, and contact management
Hi,
You can’t merge Microsoft accounts, and subscriptions don’t transfer between accounts.
If you want everything under the new account, you’ll need to:
Cancel Microsoft 365 on the old account (or wait until renewal).
Purchase Microsoft 365 on the new account.
Migrate your data (OneDrive files and Outlook emails) from the old account to the new one.
After migration, you can delete the old account if you no longer need it.
If you’d rather avoid this process, the simplest option is to keep using the old account for Microsoft 365 and set it as the primary sign-in for Office and Outlook to stop storage warnings. I hope this helps!