Office 365 Sharepoint Online – External Users
In Office 365 you can give access to your portal, to domain users, or to external users.
To give external users access, you need to go to your office 365 administration, and set your site collection Sharing Properties.
You can define if you want to enable anonymous users or only authenticated accesss:
After saving your settings, you need to go to your Portal, and invite your external users, you need to click on Share, and then enter your external users email and permissions:
Your external users, will receive an invitation email, and after they accept that, they will be able to log on.
You can monitor your invitations at “Site Settings -> Access Requests and Invitations”: