If you're running Exchange or newer, at least one server running the Mailbox role needs to be installed. If needed, Exchange Edge Transport servers can also be installed in a perimeter network and support secure mail flow with Microsoft or Office We don't support the installation of Exchange servers running the Mailbox or Client Access server roles in a perimeter network.
Office or Microsoft : Several Office and Microsoft service subscriptions include an Exchange Online organization. Organizations configuring a hybrid deployment need to purchase a license for each mailbox that's migrated to or created in the Exchange Online organization. Hybrid Configuration wizard : Exchange includes the Hybrid Configuration wizard which provides you with a streamlined process to configure a hybrid deployment between on-premises Exchange and Exchange Online organizations.
Learn more at Hybrid Configuration wizard. Azure AD authentication system : The Azure Active Directory AD authentication system is a free cloud-based service that acts as the trust broker between your on-premises Exchange organization and the Exchange Online organization. On-premises organizations configuring a hybrid deployment must have a federation trust with the Azure AD authentication system. The federation trust can either be created manually as part of configuring federated sharing features between an on-premises Exchange organization and other federated Exchange organizations or as part of configuring a hybrid deployment with the Hybrid Configuration wizard.
A federation trust with the Azure AD authentication system for your Exchange Online tenant is automatically configured when you activate your Microsoft or Office service account. Azure Active Directory synchronization : Azure AD synchronization uses Azure AD Connect to replicate on-premises Active Directory information for mail-enabled objects to the cloud to support the unified global address list GAL and user authentication.
Organizations configuring a hybrid deployment need to deploy Azure AD Connect on a separate, on-premises server to synchronize your on-premises Active Directory with Microsoft or Office Azure AD Connect cloud sync does not support hybrid migrations due to its inability to handle Exchange hybrid writeback.
Take a look at the following scenario. It's an example topology that provides an overview of a typical Exchange deployment. Contoso, Ltd. Remote Contoso users use Outlook on the web to connect to Exchange over the Internet to check their mailboxes and access their Outlook calendar.
Let's say that you're the network administrator for Contoso, and you're interested in configuring a hybrid deployment. You deploy and configure a required Azure AD Connect server and you also decide to use the Azure AD Connect password synchronization feature to let users use the same credentials for both their on-premises network account and their Microsoft or Office account.
After you complete the hybrid deployment prerequisites and use the Hybrid Configuration wizard to select options for the hybrid deployment, your new topology has the following configuration:. Users will use the same username and password for logging on to the on-premises and Exchange Online organizations "single sign-on".
User mailboxes located on-premises and in the Exchange Online organization will use the same email address domain. For example, mailboxes located on-premises and mailboxes located in the Exchange Online organization will both use contoso.
All outbound mail is delivered to the Internet by the on-premises organization. The on-premises organization controls all messaging transport and serves as a relay for the Exchange Online organization "centralized mail transport". Organization relationships configured for both organizations also enable cross-premises message tracking, MailTips, and message search. If you compare Contoso's existing organization configuration and the hybrid deployment configuration, you'll see that configuring a hybrid deployment has added servers and services that support additional communication and features that are shared between the on-premises and Exchange Online organizations.
Here's an overview of the changes that a hybrid deployment has made from the initial on-premises Exchange organization. Now that you're a little more familiar with what a hybrid deployment is, you need to carefully consider some important issues. Configuring a hybrid deployment could affect multiple areas in your current network and Exchange organization. Active Directory synchronization between the on-premises organization and the cloud, which is performed every 30 minutes by a server running Azure Active Directory Connect, is a requirement for configuring a hybrid deployment.
Directory synchronization enables recipients in either organization to see each other in the global address list. It also synchronizes usernames and passwords which enables users to log in with the same credentials in both your on-premises organization and in Microsoft or Office If you choose to configure Azure AD Connect with AD FS, usernames and passwords of on-premises users will still be synchronized to the cloud by default.
However, users will authenticate with your on-premises Active Directory via AD FS as their primary method of authentication. All customers of Azure Active Directory and Microsoft or Office have a default limit of 50, objects users, mail-enabled contacts, and groups that determines how many objects you can create in your Microsoft or Office organization.
After you verify your first domain, this limit is automatically increased to , objects for Azure Active Directory Free, or an unlimited number of objects for Azure Active Directory Basic or Premium.
For more information, see Azure Active Directory pricing. This server should be placed in your perimeter network and will act as an intermediary between your internal ADFS servers and the Internet. The web application proxy server needs to accept connections from clients and servers on the Internet using TCP port You manage a hybrid deployment in Exchange via a single unified management console that allows for managing both your on-premises and Exchange Online organizations.
When you run the Hybrid Configuration wizard for the first time, you will be prompted to connect to your Exchange Online organization. You need to use an account that is a member of the Organization Management role group to connect the EAC to your Exchange Online organization. Secure Sockets Layer SSL digital certificates play a significant role in configuring a hybrid deployment. They help to secure communications between the on-premises hybrid server and the Exchange Online organization.
Certificates are a requirement to configure several types of services. If you're already using digital certificates in your Exchange organization, you may have to modify the certificates to include additional domains or purchase additional certificates from a trusted certificate authority CA. If you aren't already using certificates, you will need to purchase one or more certificates from a trusted CA.
Learn more at: Certificate requirements for hybrid deployments. Your network connection to the Internet will directly impact the communication performance between your on-premises organization and the Microsoft or Office organization. This is particularly true when moving mailboxes from your on-premises Exchange server to the Microsoft or Office organization. The amount of available network bandwidth, in combination with mailbox size and the number of mailboxes moved in parallel, will result in varied times to complete mailbox moves.
Additionally, other services, such as SharePoint Server and Skype for Business, may also affect the available bandwidth for messaging services. Determine the average connection and throughput speed for your connection to the Internet from your on-premises organization.
Learn more at: Networking. Unified Messaging UM is supported in a hybrid deployment between your on-premises and Microsoft or Office organizations. Your on-premises telephony solution must be able to communicate with the cloud. This may require that you purchase additional hardware and software.
If you want to move mailboxes from your on-premises organization to the cloud, and those mailboxes are configured for UM, you should configure UM in your hybrid deployment prior to moving those mailboxes. If you move mailboxes before you configure UM in your hybrid deployment, those mailboxes will no longer have access to UM functionality. AD RMS templates can help prevent information leakage by allowing users to control who can open a rights-protected message, and what they can do with that message after it's been opened.
IRM in a hybrid deployment requires planning, manual configuration of the Microsoft or Office organization, and an understanding of how clients use AD RMS servers depending on whether their mailbox is in the on-premises or Exchange Online organization.
Learn more at: IRM in Exchange hybrid deployments. Mobile devices are supported in a hybrid deployment. If Exchange ActiveSync is already enabled on your existing servers, they'll continue to redirect requests from mobile devices to mailboxes located on the on-premises Mailbox server. For mobile devices connecting to existing mailboxes that are moved from the on-premises organization to the cloud, Exchange ActiveSync profiles will automatically be updated to connect to the cloud on most phones.
All mobile devices that support Exchange ActiveSync should be compatible with a hybrid deployment. Learn more at: Exchange ActiveSync. We recommend that your clients use Outlook or Outlook for the best experience and performance in the hybrid deployment. Pre-Outlook clients aren't supported in hybrid deployments or with Microsoft or Office To create mailboxes in, or move mailboxes to, Microsoft or Office , you need to sign up for an appropriate subscription plan you must have licenses available.
When you sign up, you'll receive a specific number of licenses that you can assign to new mailboxes or mailboxes moved from the on-premises organization. Each mailbox in the cloud must have a license. Mailboxes moved to the cloud are automatically provided with antivirus and anti-spam protection by Exchange Online Protection EOP , a service provided by Microsoft and Office You may need to purchase additional EOP licenses for your on-premises users if you chose to route all incoming Internet mail through the EOP service.
We recommend that you carefully evaluate whether the EOP protection in your Microsoft or Office is also appropriate to meet the antivirus and anti-spam needs of your on-premises organization. If you have protection in place for your on-premises organization, you may need to upgrade or configure your on-premises antivirus and anti-spam solutions for maximum protection across your organization. Learn more at: Anti-spam and anti-malware protection in EOP. Public folders are supported in the cloud and on-premises public folders can be migrated to the cloud.
Additionally, public folders in the cloud can be moved to the on-premises Exchange organization. Both on-premises and cloud users can access public folders located in either organization using Outlook on the web, Outlook , Outlook , or Outlook SP2 or newer. Existing on-premises public folder configuration and access for on-premises mailboxes doesn't change when you configure a hybrid deployment.
Learn more at: Public folders. For information about keyboard shortcuts that may apply to the procedures in this checklist, see Keyboard shortcuts for the Exchange admin center.
The following list provides you with definitions of the core components associated with hybrid deployments in Exchange The hybrid configuration option in which all Exchange Online inbound and outbound Internet messages are routed via the on-premises Exchange organization.
This routing option is configured in the Hybrid Configuration wizard. For more information, see Transport options in Exchange hybrid deployments. An accepted domain added to the on-premises organization for hybrid mail flow and Autodiscover requests for the Microsoft or Office service. This domain is added as a secondary proxy domain to any email address policies which have PrimarySmtpAddress templates for domains selected in the Hybrid Configuration wizard. The Active Directory object in the on-premises organization that contains the desired hybrid deployment configuration parameters defined by the selections chosen in the Hybrid Configuration wizard.
The Hybrid Configuration Engine uses these parameters when configuring on-premises and Exchange Online settings to enable hybrid features. The contents of the HybridConfiguration object are reset each time the Hybrid Configuration wizard is run. Examples of hybrid in a Sentence Noun a hybrid of two roses The band plays a hybrid of jazz and rock. DreamCloud Ending Dec. First Known Use of hybrid Noun , in the meaning defined at sense 1 Adjective circa , in the meaning defined at sense 1.
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