I have a 600 users that use sharepoint with a Live-account. I created all the mail addresses in a domain. These users are also on the website as joomla user.
So i have them in a format:
userid - username - emailaddress
so email is actually the same as the live-account address.
Is it possible to connect the live-account with the existing joomla-account in batch so the users must not connect them by themselve?
No, you can't. The user must authenticate on the site on their own with their Live credentials so that they can approve your app. Without that approval, the app doesn't have the permissions it needs to fetch the user's email address, Live ID, and other profile information required to log them into the site.
I hope that helps explain, but if you need anything else, just let us know.