Microsoft Planner service allows you to easily create a plan, build a team, assign tasks, and update status. Yesterday, on the Office 365 Message Centre, Microsoft announced that the project management app now supports Guest Access.
Guest access in Office 365 Groups and Microsoft Teams enables end users to collaborate with people from outside your organization. If you decide to enable guest access, as administrator, you can grant access to group conversations, team chats, files, calendar invitations, and the group notebook. With this update, guest users will also be able to access Planner plans for any groups and teams they’ve been added to.
Microsoft will begin rolling the feature out over the next few days, and anticipate rollout will be completed by the end of April.