Populating Team or Group Membership from Distribution Lists

Exchange Online distribution lists can be used to populate the membership of Office 365 Groups or Teams by applying a little PowerShell magic. Here’s how.

Blocking Guest Users from Office 365 Groups

By default, the Groups policy for an Office 365 tenant allows group owners to add guest users to group membership. You can block this access if necessary, but it’s probably not what you want to do as blocking brings guest access to a complete halt across the tenant.

Existing Guest Accounts and the Azure B2B Collaboration Policy

When you impose a block on certain domains, you’d like to think that applications like Teams will respect that block. As it turns out, if you have some lingering guests in your Azure Active Directory, the B2B collaboration policy might not be as effective as you’d hope.