What is/is not migrated during an Exchange to Office 365 Migration

For the most part all of the core User mailbox components are fully migrated: Calendar, Contacts, Email, Notes, Tasks.  Resource mailboxes (e.g. conference room) and Distribution Groups are also fully migrated.  Mail contacts (setup within the Global Address List) are only migrated when using a Cutover Exchange Migration (not with a Staged Exchange Migration).

Certain advanced features and special mailbox types are not migrated.  See the Exchange Online Help Article: What is Migrated in an Exchange Migration for detailed information.

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