If your organization has many large PST files, you can use the Import Service to migrate email data to Microsoft 365 or Office 365. Use the Import Service to migrate PST files You have Exchange 2010 and want to migrate mailboxes in small batches over time.įor more information, see Use the Microsoft 365 and Office 365 mail migration advisor. You have Exchange 2010 and more than 150-2,000 mailboxes. Use this type of migration to maintain both on-premises and online mailboxes for your organization and to gradually migrate users and email to Microsoft 365 or Office 365.
Migrate using an integrated Exchange Server and Microsoft 365 or Office 365 environment (hybrid) To perform the migration tasks, see Perform a staged migration of Exchange Server 2003 and Exchange 2007 to Microsoft 365 or Office 365. For an overview of staged migration, see What you need to know about a staged email migration to Microsoft 365 or Office 365.
Use this type of migration if you're running Exchange 2003 or Exchange 2007, and there are more than 2,000 mailboxes. Migrate mailboxes in batches (staged migration) With cutover migration, you can move up to 2000 mailboxes, but due to length of time it takes to create and migrate 2000 users, it is more reasonable to migrate 150 users or less.
