Opt for Zimbra to Office 365 Migration Tool to directly upload Zimbra mailbox to Office 365 with emails, contacts, calendars, and other items. The Zimbra to Office 365 Migration Tool has user-friendly working and provides an environment that is easily operable by all technical and novice users. Zimbra to Office 365 Migration Tool provides many features with the help of which users can upload Zimbra mailbox to Office 365 according to their requirements. However, Zimbra to Office 365 Migration Tool has a free demo also with the help of which users can test the process to upload Zimbra mailbox to Office 365 for free. They can upload first 25 files from Zimbra mailbox to Office 365 free of cost.