To Batch Export OST files into MBOX format? Then I would like to suggest you can also try ZOOK OST to MBOX Converter to batch export OST files into MBOX Format. The software is easily compatible with all the latest and earlier versions of MS Outlook and it can smoothly work on the latest Windows OS i.e. Windows 10, 8, 7, etc. In order to convert OST to MBOX format, users need to choose the OST file and select destination location to initiate the conversion process in the system. OST to MBOX Converter also offers to batch export OST to MBOX for Mac Mail, Thunderbird, Eudora, Opera Mail and many more. In the trial edition, users are offered to export 25 items from each folder of OST file to MBOX format.