To use two Microsoft accounts simultaneously on the same computer, you can add both accounts to the Windows 11 Mail and Calendar app. This will allow you to access both accounts' emails, calendars, and contacts side-by-side without having to switch accounts. However, it is not possible to use both OneDrive accounts side-by-side in File Explorer without switching accounts. OneDrive can only be signed in to one account at a time in File Explorer.
To add both Microsoft accounts to the Mail and Calendar app on Windows 11, follow these steps:
- Open the Mail and Calendar app.
- Click on the gear icon in the bottom left corner to open Settings.
- Click on "Manage accounts" and then "Add account".
- Follow the prompts to sign in to your second Microsoft account.
- Once both accounts are added, you can switch between them by clicking on your profile picture in the top right corner and selecting the account you want to use.
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