If your referring to access Office applications using different Microsoft account, open Office application > click on ‘File’ > Accounts > sign out from the existing account and log in with different account. Regarding changing the email address associated with product registrations of Office 365, refer to the following link :.
Another frequently asked inquiry is “Can I change my microsoft 365 email address?”.
MS does not provide the option of changing email addresses associated with a 365 license. The options as I see them are: if you are on a monthly subscription, cancel subscription at the end of current month and buy a new subscription which you use your new email to activate.
If yes, please sign into Office 365 with your admin account, then click the avatar in the up-right corner and navigate to My account> Personal info. You can edit the alternate email by clicking Edit near Contact details as the following picture shows.
So, how to change email alias in Microsoft 365?
In the admin center, go to the Users > Active users page. Select the user’s name, and then on the Account tab select Manage username. In the first box, type the first part of the new email address. If you added your own domain to Microsoft 365, choose the domain for the new email alias by using the drop-down list. Select Save changes.
How to change the email account associated with a 365 license?
There is no documented easy way of changing the email account associated with a 365 license. MS designed the email account to be the primary “key” to the system and has not provided a way to change it.
How do I change my email account in outlook for Windows?
Update or change your email settings in Outlook for Windows Open Outlook and select File. Use the dropdown under Account Information to select the account you want to change.
Change a user’s email address. In the admin center, go to the Users > Active users page. Select the user’s name, and then on the Account tab select Manage username. In the first box, type the first part of the new email address.