Microsoft 365 Developer Blog

A developer platform for building collaborative apps for hybrid work

New Nested App Authentication for Office Add-ins: Legacy Exchange tokens off by default in October 2024

April 9, 2024 Apr 9, 2024 04/9/24

Ben Siler

Announcing the public preview of Nested App Authentication (NAA) and that legacy Exchange user identity tokens and callback tokens will be turned off by default for all Exchange Online tenants in October 2024.

Update to Exchange callback tokens for Outlook add-ins

October 26, 2023 Oct 26, 2023 10/26/23

Akhilesh Shah

Learn how to prepare for the upcoming change to Exchange callback tokens and avoid any disruptions in your Outlook add-ins.

Application Access Policy Support Added to Exchange Web Services in Exchange Online

February 5, 2021 Feb 5, 2021 02/5/21

Microsoft 365 Platform team

We previously introduced Application Access Policy support for Microsoft Graph, and we are now adding Application Access Policy support to Exchange Web Services (EWS) in Exchange Online.

Announcing OAuth Support for POP in Exchange Online

May 28, 2020 May 28, 2020 05/28/20

Office Add-ins team

We’re happy to be able to confirm OAuth support for POP is also now available in Exchange Online.

Announcing OAuth 2.0 support for IMAP, SMTP client protocols in Exchange Online

April 30, 2020 Apr 30, 2020 04/30/20

Sivaprakash Saripalli

Announcing the availability of OAuth 2.0 authentication for IMAP, SMTP AUTH protocols to Exchange Online mailboxes.

Postponed- iCalUId update on Microsoft Graph

April 7, 2020 Apr 7, 2020 04/7/20

Microsoft Graph team

In a blog post dated February 25, 2020, we announced plans to update iCalUId on Microsoft Graph to make it adhere to its industry definition. Since then, many of our customers' priorities have changed in response to the COVID-19 crisis. As a result, we have decided to postpone making this update. We will provide the developer community ...

Deferred end of support date for Basic Authentication in Exchange Online

April 3, 2020 Apr 3, 2020 04/3/20

Sivaprakash Saripalli

Last year we announced end of support for Basic Authentication for Exchange Web Services (EWS), Exchange Active Sync (EAS), Post Office Protocol (POP), Internet Message Access Protocol (IMAP), and Remote PowerShell (RPS) in Exchange Online. In response to the COVID-19 crisis and knowing that priorities have changed for many of our ...

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