I create and maintain several Trello boards for my consulting clients. If I upgrade to professional, do all of my clients who collaborate on the boards have to as well?
@Ross Novotny They don't have to upgrade, but any Trello user who is a member of more than one of your boards in a business class team will be billable to you as the owner of the team:
https://help.trello.com/article/855-how-billing-works-with-trello-business-class
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