The Shoviv Exchange to Office 365 Migration tool (Shoviv Exchange Server Suite) is really good in helping you to migration from on-premises Exchange to Office 365. This utility gives an easy-to-use interface, which is able to migrate various data sources like Exchange Server mailboxes, Office 365 mailboxes, Outlook PST files, EDB files and Outlook profiles. That represents 90 percent of the migration process and reduces the possibility of data loss and human mistakes. It comes with features like source mapping, folder mapping, and selective item migration, which makes it somewhat easier to perform the migration and ensure the fidelity of the migration.
The tool also available itself in a FREE demo version. I hope this helps! Let me know if you have any other questions.