No idea, we do Thunderbird here. but if I understand Zimbra, you can still access your mail through Thunderbird as IMAP.

See https://wiki.zimbra.com/wiki/Accessing_Zimbra_Collaboration_Server_with_Thunderbird

Thanks Matt for suggestions for your solution does not helped me.

I end up searching a solution from this webpage http://www.bitrecover.com/mbox-converter/zimbra/ and it works for me.

It converted all of my Thunderbird email messages to Zimbra compatible format.

Thanks one again.

Interesting how that link became example.com

No my answer did not help you, that is because your stuck on importing to Zimbra. You could have added your zimbra account to Thunderbird and put whatever mail was in Thunderbird into the Zimbra account. But no you wanted an importer.

Well we do Thunderbird here, Zimbra does Zimbra and import into it

You asked the wrong people and were not happy I did not give you the answer you wanted. That it works and is the preferred method of import into Zimbra is totally irrelevant.

If you had used the information Zimbra provided on their web site https://wiki.zimbra.com/wiki/Mail_Migration you would not have needed to ask a question or Google anything. You would have saved $99 and probably would have had the job done while you were googling.