11/16/2023 0 Comments Office 365 migration planNumber of mailboxesĮxchange Hybrid If you have more than 150 mailboxes, the best method is to use an Exchange hybrid migration where you can migrate a limited number of users at a time. If your source system is Exchange 2010, Exchange 2013, or Exchange Server 2016, consider the following options.Įven though cutover migration support moving up to 2000 mailboxes, due to length of time it takes to create and migrate 2000 users, it is more reasonable to migrate 150 users or less. You can search for partners on the Microsoft solution providers page. If you have an extremely large number of mailboxes (5,000+), you might want to hire a partner to help you migrate your email data. You can use the Microsoft 365 or Office 365 Import Service to either ship the files or to import them across the network. If the mailboxes you're migrating contain a large amount of data, you can also use the Import service to import PST files to Microsoft 365 or Office 365. This is because cutover migration performance suffers when you try to migrate more than 150 mailboxes. Staged If you have more than 150 mailboxes, the best method is to use staged migration where you can migrate a limited number of users at a time. Staged For an overview, see What you need to know about a staged email migration. Slowly, by migrating a few users at a time. Number of mailboxesĬutover For an overview, see What you need to know about a cutover email migration to Microsoft 365 or Office 365. Note that IMAP migration will copy over only email data.Įven though cutover migration supports moving up to 2000 mailboxes, due to length of time it takes to create and migrate 2000 users, it is more reasonable to migrate 150 users or less. You can also use the Internet Message Access Protocol ( IMAP) migration from Exchange servers, and if your Exchange server is older than Exchange 2003, IMAP migration is your only option. These migration methods copy over all mail data, including contacts, calendar items, and tasks. The available methods are cutover, staged, and Exchange Hybrid migrations. Your existing system is an Exchange Serverįor migrations from an existing on-premises Exchange Server environment, you can migrate all email, calendar items, tasks and contacts from user mailboxes to Office 365. The content in the following sections is organized by email system, and the linked topics help you decide on the best method based on number of mailboxes and your time and mailbox size constraints. You, as global administrator, can migrate mailboxes from an Exchange Server or from another email system. How do I decide which method to use?īefore you start an email migration, review the limits and Migration performance and best practices for Exchange Online to make sure you get the performance and behavior you expect after migration. If you want to migrate email for a single account, see Migrate email and contacts to Microsoft 365 or Office 365 instead. This topic is intended for global administrators.
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