Product documentation (migration) — Microsoft 365 Business

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Facts read from this source

• Migration types Report an error

  “There are three types of email migrations that can be made from an Exchange Server:”

• Cutover limit Report an error

  “With cutover migration, you can move up to 2,000 mailboxes, but due to length of time it takes to create and migrate 2,000 users, it's more reasonable to migrate 150 users or less.”

• Cutover supported versions Report an error

  “Use this type of migration if you're running Exchange 2003, Exchange 2007, Exchange 2010, or Exchange 2013, and if there are fewer than 2,000 mailboxes.”

• Staged use case Report an error

  “Use this type of migration if you're running Exchange 2003 or Exchange 2007, and if there are more than 2,000 mailboxes.”

• Hybrid use case Report an error

  “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.”

• Hybrid conditions Report an error

  “You have Exchange 2010 and more than 150-2,000 mailboxes. You have Exchange 2010 and want to migrate mailboxes in small batches over time. You have Exchange 2013 or later.”

• Pst import service Report an error

  “If your organization has many large PST files, you can use the Import Service to migrate email data to Microsoft 365 or Office 365. You can use the Import Service either to upload the PST files through a network or to mail the PST files in a drive that you prepare.”

• Imap scope Report an error

  “When you migrate the user's email by using IMAP, only the items in the users' inbox or other mail folders are migrated. Contacts, calendar items, and tasks can't be migrated with IMAP; a user can manually migrate them.”

• Imap mailbox creation Report an error

  “IMAP migration also doesn't create mailboxes in Microsoft 365 or Office 365. You'll have to create a mailbox for each user before you migrate their email.”

• Imap sources Report an error

  “You can use the Internet Message Access Protocol (IMAP) to migrate user email from Gmail, Exchange, Outlook.com, and other email systems that support IMAP migration.”

• Self import Report an error

  “Users can import their own email, contacts, and other mailbox information to Microsoft 365 or Office 365.”

• Partner migration Report an error

  “If none of the types of migrations described will work for your organization, consider working with a partner to migrate email to Microsoft 365 or Office 365.”

• Post migration email Report an error

  “After the email migration is done, any new mail sent to the source email isn't migrated.”

• Fasttrack Report an error

  “Another option available to assist you with your email migration is FastTrack Center Benefit Overview. FastTrack specialists can help you plan and perform your migration.”

• Provisioning cross tenant Report an error

  “Cross-tenant Migration Exchange > Online > Tenant A Exchange > Online > Tenant B Mail User with ExchangeGuid + matching attributes”

• Provisioning cutover Report an error

  “Cutover migration Exchange > On-premises Exchange > Online No recipient (migration service creates the mailbox in EXO)”

• Provisioning gmail Report an error

  “Gmail migration Google Workspace Exchange > Online Mail User (migration service converts to mailbox in EXO)”

• Express migration Report an error

  “For information on how to use the Express migration, see Use express migration to migrate Exchange mailboxes to Microsoft 365 or Office 365.”

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