Want to transfer Apple Mail email to Gmail account? Then, go with MacMister Apple Mail Converter for Mac Tool which helps all kinds of users to quickly move data from Apple Mail to Gmail including emails, contacts, tasks, journals, notes, etc. There is no file size restriction, one can export a large size of Offline OST files in Gmail. Throughout the conversion procedure, it preserves all the mailbox items and folder structures without any data loss or alterations.  It’s available for both macOS and Win OS platforms. A free demo version available to check the program’s performance.