SharePoint Online now supports unlimited external users

Microsoft updated its SharePoint Online platform to supported unlimited external users.

SharePoint Online: software boundaries and limits is updated. This update applies to small business, midsize business, Enterprise, Education, and Government.

External users are uses who are not employees, contractors, or affiliates to your organisation (Microsoft)

Check this presentation for more details on how to plan for external users in your Office 365 implementation SharePoint Online – What is an external user

Related Sources: