If you are thinking about  How to convert Import EML to ZImbra desktop client so i recommend you eSoftTools EML to Zimbra Converter Software can convert single as well as multiple folders having EML file into Zimbra file. The converted TGZ file has the same email message preview as they are in the original EML file.

Some characteristics of EML to Zimbra converter Software-

• Allow convert all EML files items.

• Add EML folders 

• Displays working status

• Save 20 EML email messages free in demo 

• Converts Emails with metadata. 

For more info - Convert Import EML to ZIMBRA desktop Client