2,387 questions with Exchange | Hybrid management tags

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Provide access to folders

Hi All, I am using an Exchange Hybrid environment where users are created on-premises and then migrated to Exchange Online. I have a user, for example user1(at)contoso.com. In Outlook, user1 has a folder named Projects, which contains multiple…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2026-01-21T22:47:42.2733333+00:00
Rising Flight 6,276 Reputation points
answered 2026-01-21T22:48:21.4+00:00
Q&A Assist
2 answers

Exchange Hybrid: Remote mailbox users unable to receive mail after hybrid connector intermittently fails

We’re running an Exchange Hybrid deployment (Exchange 2019 + Exchange Online) where on-premises mailboxes can send and receive mail normally, but remote (cloud) mailboxes intermittently stop receiving inbound messages from on-prem. Hybrid configuration…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2026-01-20T07:49:54.24+00:00
Carter Jackson 0 Reputation points
commented 2026-01-21T11:18:51.9833333+00:00
Steven-N 18,400 Reputation points Microsoft External Staff Moderator
1 answer

There is a domain abc.com which is currently sending/receiving email through Google (Gmail/Google Workspace). But we want to route the email flow of the same domain through Exchange Online as well. The problem is that the abc.com domain is also running on

There is a domain abc.com which is currently sending/receiving email through Google (Gmail/Google Workspace). But we want to route the email flow of the same domain through Exchange Online as well. The problem is that the abc.com domain is also running…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2026-01-07T10:53:37.9466667+00:00
Neeraj gautam 20 Reputation points
answered 2026-01-07T14:03:17.77+00:00
Hin-V 11,655 Reputation points Microsoft External Staff Moderator
2 answers

Exchange online hybrid setup

Exchange 2019 Cu14. I've seen demos running the hybrid configuration wizard but I still have some unanswered questions. What is the main difference between the minimum and full hybrid options in the wizard? Once the wizard completes, what all is needed…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-12-22T15:55:55.8666667+00:00
Susan Dodds 376 Reputation points
commented 2026-01-07T04:20:33.11+00:00
Hani-Ng 7,000 Reputation points Microsoft External Staff Moderator
2 answers

Exchange: An unknown error has occurred. Refer to correlation ID: <Removed PII>

Dears, User profile showing below error and not synchronizing data for On-premise to Exchange Online "Exchange: An unknown error has occurred. Refer to correlation ID:<Removed PII>

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-11-12T14:14:21.4633333+00:00
Jeevan PK 0 Reputation points
commented 2026-01-06T17:53:42.4666667+00:00
CS 1 Reputation point
1 answer

Tenant to tenant migration

We completed tenant (source) m365 Domain A to tenant (destination) m365 Domain B migration. Migrated Users using domain B accounts and wish to continue receive emails from Domain A accounts. Tasks:1 1.Now we are looking to detach domain A from source…

Exchange Online
Exchange Online
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
6,896 questions
Exchange | Exchange Server | Other
Exchange | Exchange Server | Other
A robust email, calendaring, and collaboration platform developed by Microsoft, designed for enterprise-level communication and data management.Miscellaneous topics that do not fit into specific categories.
1,561 questions
Exchange | Exchange Server | Development
Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
8,091 questions
Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2023-06-20T15:12:52.9866667+00:00
TA.Saurabh.Singh 41 Reputation points
commented 2026-01-06T06:14:12.73+00:00
Bonney Sharma 0 Reputation points
1 answer One of the answers was accepted by the question author.

How to migrate user mailboxes in an Exchange hybrid setup

How to migrate user mailboxes in an Exchange hybrid setup (on-premises Exchange and Exchange Online) with minimal downtime and no mail flow disruption. Specifically, what are the recommended steps and prerequisites for initiating remote move migrations,…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2026-01-01T09:35:25.15+00:00
Rachal Camp 80 Reputation points
commented 2026-01-01T14:37:53.69+00:00
Hin-V 11,655 Reputation points Microsoft External Staff Moderator
2 answers One of the answers was accepted by the question author.

Any drawbacks or consequences to disabling built-in administrator account mailbox (hybrid scenario)?

We are looking to shut down (yes, we know not to uninstall) our last Exchange server after migrating all mailboxes to Microsoft 365, per this MS…

Windows for business | Windows Client for IT Pros | Directory services | Active Directory
Microsoft 365 and Office | Install, redeem, activate | For business | Windows
Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
8,091 questions
Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2023-11-13T19:53:00.3333333+00:00
Brian Hall 101 Reputation points
commented 2025-12-30T16:38:01.0733333+00:00
Justin Emlay 0 Reputation points
1 answer

Microsoft Filtering Management service (FPS) is crashing

Hi, i have Exchange 2016 CU23 with latest SU (august 2022). Mail flow is working fine but Microsoft Filtering Management service (FPS) is crashing. I can start it, but it crashes in 5 minutes. I tried with "Set-MalwareFilteringServer…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2022-08-23T07:09:37.163+00:00
Mario Grdiša 91 Reputation points
recommended 2025-12-28T17:42:53.6066667+00:00
JuliaMarvin 17,400 Reputation points Volunteer Moderator
2 answers

Free Busy not viewable from On-Premises Mailbox to Exchange Online Mailbox and vice versa for non-synchronized On Premises users

Hello Everyone We have implemented and testing Exchange Hybrid in our environment using a Exchange 2019 server that was in place upgraded to Exchange SE and then using the HCW to enable Hybrid over Microsoft 365. We are using a Full Classic Hybrid Mode…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-12-08T15:26:04.5766667+00:00
Dennis Kwok 20 Reputation points
edited a comment 2025-12-19T03:56:06.37+00:00
Jade-T 9,345 Reputation points Microsoft External Staff Moderator
2 answers

Generic Mailbox is onpremise account and user is on exchangeonline, therefore we are unable to grant delegation "send as" although we have granted send on behalf access. please explain why?

Generic Mailbox is onpremise account and user is on exchangeonline, therefore we are unable to grant delegation "send as" although we have granted send on behalf access. please explain why? Also is there any possibility to grant "send…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-12-09T15:43:12.1366667+00:00
Priyanka Thool 0 Reputation points
commented 2025-12-15T05:36:45.27+00:00
Jade-T 9,345 Reputation points Microsoft External Staff Moderator
1 answer

What to do? SE or Decommission

I’ll start by outlining our current environment for context: Two standalone Exchange Server 2016 VMs. Primarily used for recipient management in a hybrid setup. Also functions as an anonymous relay for two LOB applications — one of which requires the…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-11-29T00:17:03.9066667+00:00
vas90 0 Reputation points
commented 2025-12-15T04:08:15.8433333+00:00
Austin-H 7,495 Reputation points Microsoft External Staff Moderator
1 answer

UpdateMovedMailboxPermanentException error While migrating Large Archive mailbox to Exchange online in Hybrid Environment.

Hello All, We are using Exchange 2019 in Hybrid mode configured with O365. We are able to migrate the mailboxes successfully however facing error while migrating a mailbox of Primary mailbox size 49 GB and Archive mailbox size around 172 GB from on-prem…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-12-11T03:08:57.1233333+00:00
Sudhir Bidye 0 Reputation points
commented 2025-12-12T04:14:27.48+00:00
Kha-N 6,650 Reputation points Microsoft External Staff Moderator
1 answer

Exchange SE - Hybrid - Modern Authentication - Conditional Access

I enabled Modern Authentication on Exchange On-premise (version SE) according to Microsoft’s procedure. I would therefore like to use Conditional Access. However, when I use Microsoft Outlook on iOS, an Exchange (hybrid) profile is created during…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-11-19T23:31:28.6866667+00:00
HanakJ 86 Reputation points
commented 2025-12-11T09:12:06.2966667+00:00
Hani-Ng 7,000 Reputation points Microsoft External Staff Moderator
2 answers One of the answers was accepted by the question author.

fix the issue with on-premises Active Directory accounts not being able to hide from GAL

How to fix the issue with on-premises Active Directory accounts not being able to hide from GAL

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-11-26T21:45:51.5466667+00:00
Delgadillo, Raul 20 Reputation points
commented 2025-12-11T00:36:48.3366667+00:00
Delgadillo, Raul 20 Reputation points
3 answers

AD User mailbox not showing up in EAC

Hey all. We are using a hybrid environment for Exchange, and the way we normally set new users up is by setting them up in AD and letting it sync to Exchange. Right now I have a user that we are setting up as a service email account, and its all set up…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-12-05T15:02:08.28+00:00
Faas, Jason 20 Reputation points
commented 2025-12-09T07:10:22.86+00:00
Jack-Bu 5,745 Reputation points Microsoft External Staff Moderator
2 answers One of the answers was accepted by the question author.

Upgrading Exchange Server to Exchange Subscription Edition or Parallel install then Decommission?

We are currently using a Hybrid Azure AD/Entra ID synchronisation setup with Entra Connect to synchronise our users.    All of my users have been successfully migrated from the on-premises Exchange Server 2016 to Exchange Online.    Additionally, all…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-11-21T07:27:30.0833333+00:00
EnterpriseArchitect 6,301 Reputation points
commented 2025-12-09T04:13:39.5566667+00:00
EnterpriseArchitect 6,301 Reputation points
4 answers

HMA with ActiveSync won't work with Exchange Server 2019 CU14 HU April but work with CU14 SU March

Hello, I have deployed two environments with similar configuration : Exchange 2019 CU14 Hybrid with Exchange Online / Intune. HMA is implemented on-premises to allow Outlook mobile clients to access on-premises mailboxes using Modern Authentication : On…

Exchange Online
Exchange Online
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
6,896 questions
Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
8,091 questions
Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
Exchange | Other
Exchange | Other
A powerful email and collaboration platform developed by Microsoft, designed to support enterprise-level communication and productivity. Miscellaneous topics that do not fit into specific categories.
839 questions
asked 2024-07-03T09:00:08.35+00:00
LD-1235 5 Reputation points
commented 2025-12-08T14:15:26.34+00:00
Guido Briem 0 Reputation points
2 answers One of the answers was accepted by the question author.

Best approach to configure this feature in Exchange Server?

I’m trying to streamline our mail flow after moving most users to Exchange Online, but we still keep a couple of Exchange Server (SE/2019) boxes on-prem for management. I want to route outbound email directly through Exchange Online while still allowing…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-12-02T08:04:38.4366667+00:00
Klaus Cleo 60 Reputation points
commented 2025-12-05T17:07:54.9566667+00:00
Klaus Cleo 60 Reputation points
2 answers

Do i need CMT for outgoing email via OnPrem

Hi Exchange Community, We have a customer who has a hybrid configuration and sends and receives all incoming and outgoing emails via on-premises. For this purpose, there is an HCW connector of the type on-premises that has the flag…

Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
2,387 questions
asked 2025-11-21T07:55:06.02+00:00
ThStLearn 191 Reputation points
commented 2025-12-05T13:44:05.6833333+00:00
Steven-N 18,400 Reputation points Microsoft External Staff Moderator