I would like to recommend you secure application Zimbra to Office 365Converter Tool to convert Zimbra file to Office 365 file format. Various features are:
• It is the safe and protected tool that can capably convert Zimbra file to Office 365 and other file formats like PST, MBOX, EML, EMLX, HTML, PDF, etc.
• Corrupted file also transformed firmly and Meta properties email get move.
• This software does not make any changes while converting.
• This software is also supports all version of MS Outlook & Windows.
Read more: https://www.kdetools.com/zimbra/office-365.html

Click image for larger version. 

Name:	point-zimbra2office365-login.jpg 
Views:	25 
Size:	98.9 KB 
ID:	3164