How can I export Mozilla Thunderbird MBOX to Gmail account? Download the latest MBOX email export toolkit, software helps you to export Mozilla Thunderbird MBOX to Gmail account online by keeping complete data safe such as; email header items, attachments, images, etc. Batch export Mozilla Thunderbird MBOX to Gmail also can be done in quick mode to save users valuable time and effort to export multiple / large number of MBOX files into Gmail account. Download the free MBOX file export version to test its working ability.