Reactive Training Systems

You can use third party application like KDETools Zimbra to Exchange Server Converter tool.

Several features are:

• This application also export Zimbra files to Exchange Server and additional file formats such as PST, MBOX, MSG, EML, EMLX, PDF, HTML, etc.
• You can easily extracts all the necessary mail data like To, Bcc, Cc, Sent, From, Received, Attachments, etc.
• This application easily import Zimbra file to Exchange Server without losing data.

Read More: https://www.kdetools.com/zimbra/exchange/