A few weeks or less Full hybrid migration More than seats A few weeks or more The following sections give you an overview of these methods. Check out Decide on a migration path to learn the details of each method. Cutover migration A cutover migration is one where, at a pre-selected date and time, you'll migrate all your mailboxes, distribution groups, contacts, and so on, to Office ; when you've finished, you'll shut down your on-premises Exchange servers and start using Office exclusively.
The cutover migration method is great for small organizations that don't have very many mailboxes, want to get to Office quickly, and don't want to deal with some of the complexities of the other methods. But it's also somewhat limited because it should be completed in a week or less and because it requires users to reconfigure their Outlook profiles.
While cutover migration can handle up to 2, mailboxes, we strongly recommend you migrate a maximum of mailboxes with this method. If you try to migrate more than mailboxes, you could run out of time to transfer all the mailboxes before your deadline, and your IT support staff may get overwhelmed helping users reconfigure Outlook.
If you're thinking about doing a cutover migration, here are a few things to think consider: Office will need to connect to your Exchange servers using Outlook Anywhere over TCP port ; All on-premises mailboxes will be moved to Office ; You'll need an on-premises administrator account that has access to read the contents of your users' mailboxes; The Exchange accepted domains that you want to use in Office need to be added as verified domains in the service; Between the time you start the migration and when you begin the completion phase, Office will periodically synchronize the Office and on-premises mailboxes.
This lets you complete the migration without worrying about email being left behind in your on-premises mailboxes; Users will receive new temporary passwords for their Office account that they'll need to change when they log in to their mailboxes for the first time; You'll need an Office license that includes Exchange Online for each user mailbox you migrate; Users will need to set up a new Outlook profile on each of their devices and download their email again.
The amount of email that Outlook will download can vary. For more information, take a look at Change how much mail to keep offline. To learn more about cutover migration, take a look at: Minimal hybrid migration is great for organizations that need to take more time to migrate their mailboxes to Office , but still plan to complete the migration within a few weeks.
You get some benefits of the more advanced full hybrid migration without many of the complexities. You can control how many, and which, mailboxes are migrated at a given time; Office mailboxes will be created with the username and passwords of their on-premises accounts; and, unlike cutover migrations, your users won't need to recreate their Outlook profiles.
If you're thinking about doing minimal hybrid migration, here are a few things to consider: You'll need to perform a one-time directory synchronization between your on-premises Active Directory servers and Office ; Users will be able to log in to their Office mailbox using the same username and password they were using when their mailbox was migrated; You'll need an Office license that includes Exchange Online for each user mailbox you migrate; Users don't need to set up a new Outlook profile on most of their devices some older Android phones might need a new profile and won't need to re-download their email.
To learn more about minimal hybrid migration, take a look at Use Minimal Hybrid to quickly migrate Exchange mailboxes to Office Full hybrid A full hybrid migration is one where your organization has many hundreds, up to tens of thousands, of mailboxes and you want to move some or all of them to Office Because these migrations are typically longer-term, hybrid migrations make it possible to: Be properly evaluated and processed by transport and compliance agents targeting internal messages; Bypass anti-spam filters.
Full hybrid migrations are best for organizations that expect to stay in a hybrid configuration for many months or more. You'll get the features listed earlier in this section, plus directory synchronization, better integrated compliance features, and the ability to move mailboxes to and from Office using online mailbox moves.
Office becomes an extension of your on-premises organization. If you're thinking about doing a full hybrid migration, here are a few things to consider: Full hybrid migrations aren't suited to all types of organizations. Due to the complexity of full hybrid migrations, organizations with less than a few hundred mailboxes don't typically see benefits that justify the effort and cost needed to set one up. Important If your organization chooses to migrate mailboxes to Office but intends to keep DirSync or Azure AD Connect in place to continue managing user accounts from on-premises Active Directory, you need to keep at least one Exchange server on-premises.
This is because the source of authority remains in your on-premises Active Directory and changes need to be made there. If a full hybrid migration sounds right for you, take a look at the following resources to help you with your migration:
Download links for the latest CU, RU, and SP for Exchange Server , Exchange Server , Exchange Server , Exchange Server , and Exchange. Some Outlook features require specific versions of Microsoft Exchange Server. An example is Online Archive, which requires Microsoft Exchange Server Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems. The first version was called Exchange Server , to position it as the Current version Exchange Server Enterprise Edition supports clustering of up to 4 nodes when.
Main article: History of Microsoft Exchange Server Microsoft had sold a number of simpler email products before, but the first release of Exchange Exchange Server 4. As of , there have been nine releases. Current version[ edit ] The current version, Exchange Server ,  was released in October One of the key features of the new release is that Exchange Server can be deployed onto Windows Server Core for the first time, additionally Microsoft has retired the Unified Messaging feature of Exchange, meaning that Skype for Business on-premises customers will have to use alternative solutions for voicemail, such as Azure cloud voicemail.
New Features[ edit ] Security: Exchange Server also introduced active-active clustering, but for two-node clusters only. In this setup, both servers in the cluster are allowed to be active simultaneously.
This is opposed to Exchange's more common active-passive mode in which the failover servers in any cluster node cannot be used at all while their corresponding home servers are active. They must wait, inactive, for the home servers in the node to fail. Subsequent performance issues with active-active mode have led Microsoft to recommend that it should no longer be used.
Exchange's clustering active-active or active-passive mode has been criticized because of its requirement for servers in the cluster nodes to share the same data. The clustering in Exchange Server provides redundancy for Exchange Server as an application, but not for Exchange data.
This type of cluster can be inexpensive and deployed in one, or "stretched" across two data centers for protection against site-wide failures such as natural disasters. The limitation of CCR clusters is the ability to have only two nodes and the third node known as "voter node" or file share witness that prevents "split brain"  scenarios, generally hosted as a file share on a Hub Transport Server.
The second type of cluster is the traditional clustering that was available in previous versions, and is now being referred to as SCC Single Copy Cluster. It is designed to allow for data replication to an alternative drive attached to the same system and is intended to provide protection against local storage failures.
It does not protect against the case where the server itself fails. Unlike CCR, which requires that both servers belong to a Windows cluster typically residing in the same datacenter, SCR can replicate data to a non-clustered server, located in a separate datacenter. When a Mailbox server is added to a DAG, the Failover Clustering Windows role is installed on the server and all required clustering resources are created.
It also comes as part of the Core CAL. User and Device CALs have the same price, however, they cannot be used interchangeably. Two types of Exchange CAL are available: Clients capable of using the proprietary features of Exchange Server include Evolution  , Hiri and Microsoft Outlook. These protocols must be enabled on the server. Microsoft Exchange Server up to version 5. After version 5. Later, in Exchange Server 5. As part of Exchange Server 5. It allows a compliant device such as a Windows Mobile device or smartphone to securely synchronize mail, contacts and other data directly with an Exchange server and has become a popular mobile access standard for businesses due to support from companies like Nokia and Apple Inc.
Exchange ActiveSync Policies allow administrators to control which devices can connect to the organization, remotely deactivate features, and remotely wipe a lost or stolen devices. Third-party providers[ edit ] This has been possible from a number of providers  for more than 10 years, but as of June is that many providers have been marketing the service as "cloud computing" or "Software-as-a-Service.
It is built on the same technologies as on-premises Exchange Server, and offers essentially the same services as third-party providers which host Exchange Server instances.
Hybrid implementations are popular for organizations that are unsure of the need or urgency to do a full transition to Exchange Online, and also allows for staggered email migration.
Hybrid tools can cover the main stack of Microsoft Exchange, Lync , SharePoint, Windows, and Active Directory servers, in addition to using replica data to report cloud user experience. Exchange Server was developed concurrently as a server product and for the Exchange Online service.