Learn about the features, benefits, and limitations of Exchange Online as a part of Office 365 for business and enterprise, with emphasis on hybrid deployment.
- [Instructor] There are four different models for deploying Exchange Server 2016, and each is named for the location of the Exchanger Servers and the users. On-Premise refers to organizations where the Exchange Server is located on your servers in your data center. Hosted Exchange means that your Exchange Server and the user identity is installed on a server in someone else's data center. An exchange Online is a service from Microsoft that's part of a business or enterprise subscription to Office 365.
This can be setup like a hosted exchange environment. The difference is that the user identity and the exchange servers are hosted entirely in Microsoft's Cloud. Or the fourth option, it can be configured in a Hybrid environment where Exchange Online coexists with On-Premise Exchange in Active Directory. Some people use this as a migration path to move their On-Premise exchange function to Microsoft's Cloud.
In some Hybrid environments, the mailboxes are all located in the On-Premise exchange servers, but the archive mailboxes are placed in Exchange Online. In other environments, Office employees and resource mailboxes are located on premise while remote or mobile employees mailboxes are placed in exchange Online. Hybrid exchange environments provide a functionality that you don't often see in migration paths. You can migrate a user mailbox from the on-premise exchange server to exchange online.
That much is to be expected because that's the most common migration path. What's unique is that you can also migrate a mailbox from Exchange Online down to the On-Premise Exchange servers. This is really helpful when you consider the limitation of a hybrid environment. Users whose mailbox exist in the Exchange Online environment cannot access shared mailboxes or use mailbox delegation in the on-premise servers.
The same is also true in reverse. If a user's access needs change due to job change or something else, you can move their mailbox back and forth as needed. Different distributions will serve different business needs, but they both rely on a shared Active Directory model. It is necessary for Exchange Online to have access to your On-Premise Active Directory before you begin the synchronization of Exchange. Microsoft has offered at least three different tools to do this over the years, but only one is still supported.
Azure Active Directory Connect or AAD Connect. This tool can be installed on any member server or even a domain controller in your On-Premise domain to replicate user identity to Azure AD. This isn't really single sign-on. It's more like same sign-on where Azure stores a list of all of your users and synchronizes information about those users including their passwords from your On-Premise Active Directory.
Single sign-on requires a federated identity model that forces all authentication to be passed through to the On-Premise Active Directory. This may appear to simplify things because there is a more centralized directory, but it often slows things down for the exchange Online users. Those are some of the requirements and restrictions. One of the benefits of Exchange Online is that it's always up to date with the most current security patches and feature updates.
This helps with the stability of the online exchange server but it also places limits on the versions of On-Premise Exchange that are supported. A hybrid environment will require that On-Premise exchange servers are a minimum of Exchange Server 2010 Service Pack three, Exchange 2013 with either of the two most recent cumulative updates or Exchange Server 2016 with either of the two most current cumulative updates.
For continuity purposes, I've used Exchange Server 2016 and cumulative update four throughout many of the Exchange server courses. However, to be compatible with a hybrid environment, the demonstrations in this chapter will be using Exchange 2016 cumulative update six. The most recent cumulative update at this point.
- Preparing for hybrid configuration
- Deploying a hybrid configuration
- Troubleshooting Exchange Online
- Troubleshooting Office 365 clients
- Configuring the gateway
- Managing sharing policies
- Troubleshooting cross-forest availability
- Troubleshooting mail flow
- Migrating from earlier versions