In 2020, we announced the support of OAuth2.0 to ensure Calendar Interop continues to be available after Microsoft’s disablement of basic authentication in Exchange Online. On October 1, 2022, Microsoft will begin to remove the ability to use Basic authentication in Exchange Online for Exchange Web Services. This will impact Workspace customers using Calendar Interop with Basic authentication on Microsoft Office 365 to allow Microsoft Exchange and Google Calendar to work together.
To continue using Calendar Interop, upgrade to OAuth 2.0 authentication before October 1, 2022.
This only impacts Microsoft Exchange Online implementations (Microsoft 365). If you currently use an on-premise Exchange implementation, then no action is needed.
Why you’d use itCalendar Interop enables Microsoft Exchange and Google Calendar users to view availability statuses and calendar resources (such as meeting rooms) across both systems.
Read more about Microsoft’s deprecation of Basic authentication in Exchange Online.
- Admins: Visit the Help Center to learn more about setting up Calendar Interop and the steps (#4) required to switch to OAuth 2.0.
- End users: There is no end user setting for this feature.
- Impacting Workspace customers using Calendar Interop with Basic authentication on Microsoft Office 365