To update your billing address on portal.office.com, follow these steps: Log into your account on portal.office.com and navigate to the "Admin" section, if you have admin privileges. From there, select "Billing," then click on "Billing Accounts." You’ll find the option to "Edit" the address linked to your billing profile. Make the necessary updates to your billing address and save your changes. It’s important to ensure that your billing address matches the one on your payment method to avoid any issues. This quick update ensures that all billing communications are accurate and up-to-date.