"Customers have told us they expect guest access in Teams to provide enterprise-grade security and compliance assurances", said Lori Wright, general manager for Microsoft Teams.
"Beginning today, anyone with an Azure Active Directory (Azure AD) account can be added as a guest in Teams. IT admins can quickly and easily view, add, or revoke a guest's access to the host tenant".
Anyone with an Azure Active Directory account can be added as a guest in Teams. This effectively means that users from Microsoft commercial cloud services and third-party Azure AD integrated apps can be added as a guest.
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If a guest doesn't have an existing Microsoft Account, they would have to create a free account using their email address, whether they use Outlook or other email providers such as Google's Gmail.
Microsoft on Monday announced that it is introducing the heavily-requested guest access feature to its Teams messaging platform. Conversely, the accounts still have to be some form of Azure Directory accounts, but Microsoft has stated that at some time in the future, the feature will be opened to work with any Microsoft account.
This is an important feature for Teams as many groups inside a company often use outside contractors or consultants for projects that need access to these collaboration tools. The guest accounts are added securely and managed within the Azure AD through Azure AD B2B (Business2Business) Collaboration.
Azure Active Directory provides features such as conditional access policies for guest users as well as machine learning algorithms to detect anomalies and suspicious incidents, and it can automatically trigger security processes such as multi-factor authentication when required. Slack Frontiers also begins on Tuesday.