A hybrid deployment provides the seamless look and feel of a single Exchange organization between an on-premises Exchange organization and Exchange Online in Microsoft 365 or Office 365. What you need to know about a staged email migration to Microsoft 365 or Office 365Ī hybrid deployment offers organizations the ability to extend the feature-rich experience and administrative control they have with their existing on-premises Exchange organization to the cloud. Using a staged migration, you migrate batches of on-premises mailboxes to Microsoft 365 or Office 365 over the course of a few weeks or months. You use a staged migration if you plan to eventually migrate all your organization's mailboxes to Microsoft 365 or Office 365. The mail contacts and distribution groups in your on-premises Exchange organization are also migrated.Ĭutover migration to Microsoft 365 or Office 365 Performance suffers with numbers higher than that. The recommended number of mailboxes, however, is 150. You can migrate a maximum of 2,000 mailboxes from your on-premises Exchange organization to Microsoft 365 or Office 365 using a cutover migration.

Use cutover migration if you plan to move your entire email organization to Microsoft 365 or Office 365 and manage user accounts in Microsoft 365 or Office 365. Using a cutover migration, you migrate all on-premises mailboxes to Microsoft 365 or Office 365 over a few days. Migrate your IMAP mailboxes to Microsoft 365 or Office 365 This includes migrating your mailboxes from other hosted email services, such as Gmail or Yahoo Mail. You can use the Exchange admin center or Exchange Online PowerShell to migrate the contents of users' mailboxes from an IMAP messaging system to their Microsoft 365 or Office 365 mailboxes. Internet Message Access Protocol (IMAP) migration Frequently used migration methods Migration method Microsoft 365 or Office 365 supports several methods to migrate email, calendar, and contact data from your existing messaging environment to Microsoft 365 or Office 365 as described in Ways to migrate multiple email accounts to Microsoft 365 or Office 365.įor more information about Microsoft 365 or Office 365 networking and performance, see Network planning and performance tuning for Microsoft 365 or Office 365. Overview of migrating email to Microsoft 365 or Office 365 When planning a migration to Microsoft 365 or Office 365, a common question is about how to improve the performance of data migration and optimize migration velocity.

There are many paths to migrate data from an on-premises email organization to Microsoft 365 or Office 365.

Techsoup microsoft office 365 migration