Had a huge batch of emails to transfer, and this tool made it so much easier. MacGater MBOX to PST Converter Tool helped me convert and manage multiple MBOX files at once. After converting, I was able to upload MBOX to IMAP Server without any loss of data or structure. It also filtered out duplicate emails automatically, which cleaned up my backup. You can select files or folders depending on how you’ve saved your emails. The interface is user-friendly and works fully offline, so no worries about privacy.