If your company decides to sign-on to Office 365 between September 1, 2104 and March 31, 2015, Microsoft is offering to work with you remotely to migrate your company's mailboxes. Considering that any move to Cloud email from on-premises servers could take considerable resources and time for planning, scheduling, and finally, migration, the offer is a good one.
The offer is limited to those organizations that purchase 150 licenses or more. You can choose to work directly with Microsoft or with a preferred Microsoft partner.
Supported migrations include:
- Exchange Server
- IBM Domino
- Google Gmail
Read all about it here: Office 365 Email Migration