If you are searching for some cost-effective, reliable application to convert the Zimbra file to Exchange Server, then you can use KDETools Zimbra to Exchange Server Converter. 

It is the safe and secure tool which can effectively convert Zimbra file to Exchange Server.

Convert multiple file format PST, MBOX, MSG, EML, EMLX, PDF, HTML, etc. 

Also support direct migration of Zimbra to Gmail account.

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