Convert your Thunderbird MBOX files to Outlook PST format in minutes. No software to install, works from any browser.
Thunderbird stores emails in MBOX format — open, plain-text files. Outlook uses PST files — proprietary binary databases. The two formats are completely incompatible. Outlook has no built-in MBOX import option.
Without a conversion step, your years of Thunderbird emails remain inaccessible in Outlook. MailtoPst bridges that gap by converting MBOX to PST entirely in the cloud.
Navigate to your Thunderbird profile folder. On Windows: %APPDATA%\Thunderbird\Profiles\. On Mac: ~/Library/Thunderbird/Profiles/. Look for files named Inbox, Sent, Drafts without extensions.
Go to MailtoPst and upload your MBOX files. You can ZIP multiple files together for batch conversion.
Select PST as output format. The conversion runs on cloud servers — fast regardless of your hardware.
In Outlook, go to File > Open & Export > Import/Export. Select the PST file and your emails appear in Outlook with full folder structure preserved.
Convert MBOX to PST online without installing software. Step-by-step guide with MailtoPst cloud converter. Works on Windows, Mac, and Linux.
Learn how to convert PST files to MBOX format without having Microsoft Outlook installed. Step-by-step guide for Mac, Linux, and Windows users.
Learn how to open MBOX files on Windows, Mac, and Linux. Methods include Thunderbird, Apple Mail, online viewers, and format conversion.
First conversion free. No credit card required.