In order to migrate from an on-premises environment to Office 365, Shoviv provides an excellent Office 365 Migration Tool.
This software tool is a picture-perfect fast, and secure solution. It lets you migrate to Office 365 from EDB files, Live Exchange mailboxes, Office 365, and Outlook Store mailboxes, among other locations. This tool has a user interface (GUI) that makes it easy for users who aren't tech-savvy to use.
There are no limits on how many or big mailboxes users want to migrate. It even means ensuring source mailbox data before migration. Some useful options include Folder mapping, Search, Filter Criteria, Email Translation, etc. Also, the Office 365 migration tool contains an advanced "incremental" feature. This feature lets you resume the interrupted process without duplication.
Shoviv offers a free demo version of its Office 365 migration tool. The free version helps users understand the tool works by processing the first 50 items per folder.