Azure Active Directory B2B collaboration licensing guidance
With Azure Active Directory (Azure AD) business-to-business (B2B) collaboration, you can invite External Users (or "guest users") to use your paid Azure AD services. Some features are free, but for any paid Azure AD features, you can invite up to five guest users for each Azure AD edition license that you own for an employee or a non-guest user in your tenant.
Refer to Azure Active Directory pricing for details about Azure AD pricing and B2B collaboration features.
B2B guest user licensing is automatically calculated and reported based on the 1:5 ratio.
Additionally, guest users can use free Azure AD features with no additional licensing requirements. Guest users have access to free Azure AD features even if you don’t have any paid Azure AD licenses.
Examples: Calculating guest user licenses
Once you determine how many guest users need to access your paid Azure AD services, make sure you have enough Azure AD paid licenses to cover guest users in the required 1:5 ratio. Here are some examples:
- You want to invite 100 guest users to your Azure AD apps or services and provide access management and provisioning. For 50 of those guest users, you also want to require MFA and Conditional Access, so for those features you'll need 10 Azure AD Premium P1 licenses. If you plan to use Identity Protection features with your guest users, you'll need Azure AD Premium P2 licenses in the same 1:5 ratio to cover the guest users.
- You want to invite 60 guest users who all require MFA, so you must have at least 12 Azure AD Premium P1 licenses. You have 10 employees with Azure AD Premium P1 licenses, which would allow up to 50 guest users under the 1:5 licensing ratio. You’ll need to purchase two additional Premium P1 licenses to cover 10 additional guest users.
See the following resources on Azure AD B2B collaboration: