Zimbra to Thunderbird migration is possible only with help of an additional utility i.e., Zimbra to Thunderbird converter. It is a rapid way to import Zimbra file into Thunderbird, which is actually going to prove a time-saving approach to migration. One just needs to have a Zimbra file and then, the software will convert the file in .mbox file extension allowing users to open the resultant file in Thunderbird.

Zimbra To Thunderbird software screenshot