Zimbra to Exchange Migration tool directly migrate Zimbra to Exchange Server and Office 365 account. The application maintains meta properties of emails such as to, bcc, subject, date, time,  attachment and etc. during the migration process. The supports multiple file formats such as EML, PST, EMLX, HTML, MBOX, NSF, and etc. This software has no file size limitation.

More Information: https://www.kdetools.com/blog/how-to-migrate-zimbra-to-exchange-server.html