Why does the OfficeSetup.exe for Microsoft 365 suggest my email during installation?

The email suggestion often relates to the type of license you have. For instance, I know that if you have a personal Microsoft 365 subscription, it's likely tied to the account you used to download the file. Your credentials might not be bundled with the installer, but your account information is stored for convenience during log-in. Just make sure your friend is signed into her own account when setting it up.

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It might be worth noting that some licenses, like family plans, can install on multiple devices but need to be set up under the owner's account. It might just be a prompt linked to the installer rather than your details being saved in the file itself.

Typically, the installation file is customized based on the Microsoft account used to download it. This is why your email might pop up when your friend tries to log in. It's mostly about making it easier for users to access their accounts on new devices. You might want to check if there's an option for your friend to enter her own credentials instead.