Microsoft Entra ID
GeneralExchange Hybrid
In brief
The article now describes Entra2ADExchangeOnlineAttributeWriteback (LES Writeback), including its cloud-managed attribute flow, distinction from Exchange hybrid writeback, supported attributes, mappings, and related guidance.
What Entra admins need to know
Administrators can identify the applicable writeback scenario and review the supported attribute mappings and linked guidance.
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If the checkbox for Exchange hybrid writeback is disabled, it means that the schema has not been detected. Verify that the prerequisites are met and that you have re-started the provisioning agent.
Attributes synchronized
Cloud sync writes Exchange On-lineOnline attributes back to users in order to enable Exchange hybrid scenarios.
Entra2ADExchangeOnlineAttributeWriteback (LES Writeback)
For the Exchange Online-authoritative attribute writeback (LES Writeback) scenario, see Cloud-based management of Exchange attributes for Remote Mailboxes in hybrid environments.
In this scenario, Exchange Online is the source of truth for specific Exchange-related user attributes, and cloud sync writes those cloud-managed attributes back to your on-premises Active Directory.
This differs from Exchange hybrid writeback (AAD2ADExchangeHybridWriteback), which follows the hybrid writeback template used in preview scenarios.
The following table is a list oflists the supported attributes and the mappings.mappings for LES Writeback.
| Microsoft Entra attribute | AD attribute | Object Class | Mapping Type |
|---|
@@ -3,9 +3,10 @@ title: 'Exchange hybrid writeback with cloud sync' description: This article describes how to enable exchange hybrid writeback scenarios. ms.topic: how-to ms.tgt_pltfrm: na-ms.date: 04/09/2025+ms.date: 08/25/2026 ms.subservice: hybrid-cloud-sync ms.custom: sfi-image-nochange+ai-usage: ai-assisted --- @@ -46,7 +47,16 @@ Exchange Hybrid Writeback is disabled by default. >If the checkbox for **Exchange hybrid writeback** is disabled, it means that the schema has not been detected. Verify that the prerequisites are met and that you have re-started the provisioning agent. ## Attributes synchronized-Cloud sync writes Exchange On-line attributes back to users in order to enable Exchange hybrid scenarios. The following table is a list of the attributes and the mappings.+Cloud sync writes Exchange Online attributes back to users in order to enable Exchange hybrid scenarios.++### Entra2ADExchangeOnlineAttributeWriteback (LES Writeback)+For the Exchange Online-authoritative attribute writeback (LES Writeback) scenario, see [Cloud-based management of Exchange attributes for Remote Mailboxes in hybrid environments](/exchange/hybrid-deployment/enable-exchange-attributes-cloud-management).++In this scenario, Exchange Online is the source of truth for specific Exchange-related user attributes, and cloud sync writes those cloud-managed attributes back to your on-premises Active Directory.++This differs from **Exchange hybrid writeback** (AAD2ADExchangeHybridWriteback), which follows the hybrid writeback template used in preview scenarios.++The following table lists the supported attributes and the mappings for LES Writeback. |Microsoft Entra attribute|AD attribute|Object Class|Mapping Type| |-----|-----|-----|-----|