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MC338988 – (Updated) REST API for On-Premises Mailboxes Preview Ending (archived)

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check before: 2022-03-18

Product:

Exchange, Graph API, Microsoft 365 Apps, Microsoft Graph

Platform:

Developer, Online, Web, World tenant

Status:

Change type:

Retirement, Updated message

Links:

Details:

Updated March 14, 2023: We have updated the timing of this change. Thank you for your patience.
Upcoming, we will be retiring the preview program enabling REST API access to on-premises mailboxes for Hybrid Exchange organizations.
Note: This will impact those who write code against Exchange mailboxes.
[Key points]
Timing: Beginning early June (previously early March), we will begin to return errors for any requests made for mailboxes that remain on-premises.
Action: Use Microsoft Graph for Exchange Online and Exchange Web Services (EWS) for Exchange Server on-premises
Roll-out: tenant level

Change Category:
XXXXXXX ...

Scope:
XXXXXXX ...

Release Phase:

Created:
2022-03-05

updated:
2023-07-15

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changes*

DatePropertyoldnew
2023-07-15MC preparehttps://docs.microsoft.com/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oauth
https://docs.microsoft.com/graph/graph-explorer/graph-explorer-overview
https://docs.microsoft.com/graph/use-the-api
https://techcommunity.microsoft.com/t5/exchange-team-blog/application-access-policy-support-in-ews/ba-p/2110361
https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055
he End of the REST API for On-Premises Mailboxes Preview
https://docs.microsoft.com/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oauth
https://docs.microsoft.com/graph/graph-explorer/graph-explorer-overview
https://docs.microsoft.com/graph/use-the-api
https://techcommunity.microsoft.com/t5/exchange-team-blog/application-access-policy-support-in-ews/ba-p/2110361
https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055
2023-07-15MC How AffectFAQ:
What API(s) should I use to work with Hybrid Orgs, where some mailboxes are in Exchange Online, and some are on Exchange Server?
You should continue to use Microsoft Graph to work with Exchange Online mailboxes and use EWS to work with Exchange Server (on-premises) mailboxes.
Wasn't EWS going away?
In 2018 we announced EWS in Exchange Online would no longer receive feature updates. But we have no plans currently to change the way EWS works on-premises, so using Microsoft Graph for Exchange Online and EWS for Exchange Server on-premises is the current recommendation.
If you choose to continue using EWS against Exchange Online mailboxes, you should ensure that it uses OAuth (as Basic Authentication is being turned off in Exchange Online). You should also know that it now allows restricting access to mailboxes access through mailbox access policies.
Authenticate an EWS application by using OAuth
Application Access Policy Support in EWS
Where can I get help on using Microsoft Graph?
One of the best places to start is Use the Microsoft Graph API and one of the best resources you can use to get practical is Use Graph Explorer to try Microsoft Graph APIs
Learn more:
The End of the REST API for On-Premises Mailboxes Preview
FAQ
2023-03-15MC MessagesUpcoming, we will be retiring the preview program enabling REST API access to on-premises mailboxes for Hybrid Exchange organizations.
Note: This will impact those who write code against Exchange mailboxes.
[Key points]
Timing: Beginning early March 2023, we will begin to return errors for any requests made for mailboxes that remain on-premises.
Action: Use Microsoft Graph for Exchange Online and Exchange Web Services (EWS) for Exchange Server on-premises
Roll-out: tenant level
Updated March 14, 2023: We have updated the timing of this change. Thank you for your patience.
Upcoming, we will be retiring the preview program enabling REST API access to on-premises mailboxes for Hybrid Exchange organizations.
Note: This will impact those who write code against Exchange mailboxes.
[Key points]
Timing: Beginning early June (previously early March), we will begin to return errors for any requests made for mailboxes that remain on-premises.
Action: Use Microsoft Graph for Exchange Online and Exchange Web Services (EWS) for Exchange Server on-premises
Roll-out: tenant level
2023-03-15MC TitleREST API for On-Premises Mailboxes Preview Ending(Updated) REST API for On-Premises Mailboxes Preview Ending
2023-03-15MC Last Updated03/04/2022 18:12:122023-03-14T20:51:48Z
2023-03-15MC MessageTagNamesRetirementUpdated message, Retirement
2023-03-15MC End Time04/26/2023 09:00:002023-07-31T09:00:00Z
2022-09-15MC prepareps://docs.microsoft.com/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oa
ps://docs.microsoft.com/graph/graph-explorer/graph-explorer-overvi
ps://techcommunity.microsoft.com/t5/exchange-team-blog/application-access-policy-support-in-ews/ba-p/211036
ps://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055
https://docs.microsoft.com/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oauth
https://docs.microsoft.com/graph/graph-explorer/graph-explorer-overview
https://docs.microsoft.com/graph/use-the-api
https://techcommunity.microsoft.com/t5/exchange-team-blog/application-access-policy-support-in-ews/ba-p/2110361
https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055
2022-08-27MC preparehttps://docs.microsoft.com/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oauth
https://docs.microsoft.com/graph/graph-explorer/graph-explorer-overview
https://docs.microsoft.com/graph/use-the-api
https://techcommunity.microsoft.com/t5/exchange-team-blog/application-access-policy-support-in-ews/ba-p/2110361
https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055
ps://docs.microsoft.com/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oa
ps://docs.microsoft.com/graph/graph-explorer/graph-explorer-overvi
ps://techcommunity.microsoft.com/t5/exchange-team-blog/application-access-policy-support-in-ews/ba-p/211036
ps://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-changes-to-exchange-web-services-ews-api-for-office-365/ba-p/608055

*starting April 2022

Last updated 8 months ago

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