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 anything. Free for your first conversion. Works on Windows, Mac and Linux — results in under 2 minutes.
Convert PST to MBOX format without installing Outlook. Free online converter — works on Mac, Linux and Windows. Import into Thunderbird or Apple Mail in minutes.
Open any MBOX file without Thunderbird. Free methods for Windows, Mac and Linux — including online viewer, Apple Mail import, and format conversion.
First conversion free. No credit card required.