Since Windows 11 is phasing out local accounts, how many systems can one account be setup under?

You can use a single Microsoft account on multiple Windows 10 and 11 devices. However, there are some limitations and considerations:

1. Device Registration Limitations

Microsoft allows you to register up to 10 devices to your Microsoft account for downloading Microsoft Store apps and content. If you reach this limit, you may need to remove older devices to add new ones. This limit pertains to the Microsoft Store and content syncing, not to the number of devices you can sign into with your Microsoft account.

2. Windows Activation Considerations

While you can sign in with the same Microsoft account on multiple devices, each device requires its own valid Windows license. A single Windows license cannot be shared across multiple devices. If you use a retail license key associated with your Microsoft account, activating Windows on one device may deactivate it on another.

3. Managing Multiple Devices

If you plan to use the same Microsoft account across many devices, consider the following:

• Device Registration: Regularly manage and remove devices from your Microsoft account to stay within the 10-device limit.
• Windows Activation: Ensure each device has its own valid Windows license to avoid activation issues.
• Data Syncing: Be aware that syncing settings across devices can lead to shared configurations, which may not be ideal for all scenarios.

For more detailed information, refer to https://support.microsoft.com/en-us/windows/manage-devices-used-with-your-microsoft-account-d4044995-81db-b24b-757e-1102d148f441 and https://free.blessedness.top/en-us/answers/questions/3996222/can-i-use-one-microsoft-account-on-my-two-device

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hth

Marcin