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The ProtonMail Import-Export App is an official desktop tool for paid ProtonMail users to import MBOX to ProtonMail. After installing it, log in to your ProtonMail account. In the app, choose the Import tab, select Import from MBOX, and browse to your MBOX file. Next, pick the ProtonMail folder where you want your messages to appear and start the import. The app automatically uploads all emails securely to your ProtonMail mailbox while preserving folder structure and metadata.