How to configure email clients on a multiuser PC

As the installer of LibreOffice I find that I can send documents via email quite happily. I use Thunderbird as my email client.

My partner, who uses Windows default email client, cannot; she receives the message

There is no email program associated
to perform the requested action.
Please install an email program or, if
one is already installed, create an
association in the Default Programs
control panel.

There does not appear to be any option in the settings that would control the email client for a user.

Each user on a Windows 10 system has its own Windows user profile and hence each user can have its own default email client and the setting is done the same way Windows Logo -> Setting -> Apps -> Default Apps for each user. If a user cannot use the same program another user can do, then the specific program might be installed as a user program instead of system program (using administrative privileges).

… what @anon73440385 said about user profile and client settings.

Note that it is not an application specific setting for LibreOffice, but a Windows system setting reached from the “Settings” (cogwheel) item on the “start menu”.

Also, some incarnations of Windows mail, when connecting to Microsoft’s “live” or “hotmail” services, do not behave as expected when called from a non-MS application (like LibreOffice). Suggest that your partner consider a different mail client. If you have separate user profiles (logins) on the same computer, T’bird is already installed and should be an easy transition.