SysTools Office 365 Express Migrator is an efficient software to perform Office 365 to Office 365 migration with ease. The tool transfer Office 365 mailbox to another Office 365 account. It also performs Office 365 tenant to tenant migration as the mailboxes of one domain can be transferred to another domain/tenant. The complete data of Office 365 is transferred like: emails with attachments, contacts, tasks, calendars.