I already have Microsoft 365 and only need to change my free Outlook Acct to a paid acct.

A free Outlook.com mailbox does not need to be converted separately—if your Microsoft 365 consumer subscription and Outlook.com address use the same Microsoft account, paid Outlook.com benefits activate automatically.^1^

Check whether both use the same account

1. Sign out of Outlook.com and Microsoft 365.
2. Sign back in to both using the exact Outlook.com address whose mailbox you want upgraded.
3. At Microsoft365.com, check the badge:
   • Subscribed means that account has Microsoft 365.
   • Free means the subscription belongs to a different Microsoft account.[^2^](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID] "What's the difference between a Microsoft 365 subscription and free web apps")

When correctly associated, eligible benefits include an ad-free Outlook.com interface, advanced email security, encryption, and 100 GB of mailbox storage. The storage increase can take a short time to appear after a paid subscription begins.^1^

If Microsoft 365 belongs to another account

Existing Outlook.com addresses cannot be merged into another existing Microsoft account, and an activated subscription cannot simply be transferred between accounts.^3^

Use the applicable option:

• Microsoft 365 Family, Premium, or Pro: The subscription owner can share benefits with the Outlook.com account:
  1. Open the Microsoft 365 Services & subscriptions sharing page.
  2. Select Share.
  3. Send an email invitation to the Outlook.com address.
  4. Sign in as that Outlook.com account and accept the invitation within 48 hours.
  Sharing is unavailable with Microsoft 365 Basic or Personal.[^4^](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID] "Share your Microsoft 365 subscription | Microsoft Support")
• Microsoft 365 Personal or Basic: If the subscription must be owned by the Outlook.com account, cancel or disable recurring billing on the current account and purchase the appropriate plan while signed in with the Outlook.com address. Subscriptions already activated on one Microsoft account cannot be moved directly to another.^5^ Avoid deleting the Outlook.com address; that does not make it transferable.
• Microsoft 365 business subscription: It cannot provide consumer subscription features to a personal Outlook.com mailbox. Those benefits apply only to consumer Microsoft 365 subscriptions.^1^

References

1. Subscription features in Outlook.com for Microsoft 365 subscribers | Microsoft Support
2. [What's the difference between a Microsoft 365 subscription and free web apps | Microsoft Support](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID])
3. How to link outlook.com email to 365 subscription - Microsoft Q&A
4. [Share your Microsoft 365 subscription | Microsoft Support](https://support.microsoft.com/accounts-billing/subscriptions/[Subscription ID])
5. I want to change the email associated with Microsoft 365. How can I change it to my other account? - Microsoft Q&A