How to Convert EMLX to PST (Apple Mail to Outlook)

What Is an EMLX File?

EMLX is the email storage format used by Apple Mail, the default email client on macOS and iOS. Unlike formats that store all messages in a single database, Apple Mail saves each individual email as a separate .emlx file. This one-file-per-message approach makes it straightforward for the operating system to index and search emails through Spotlight, but it also means that a mailbox with thousands of messages produces thousands of individual files.

Each EMLX file contains the full email message in a plain-text structure based on the MIME standard, along with a short Apple-specific preamble that indicates the message length. Attachments are either embedded within the EMLX file or stored alongside it in a companion folder. The format is proprietary to Apple and is not recognized by email clients outside the Apple ecosystem.

Where Are EMLX Files Stored on Mac?

Apple Mail stores its data in a location that is hidden by default. Your EMLX files are located inside:

~/Library/Mail/V10/

The version number in the folder name (V10, V9, etc.) varies depending on your macOS version. Inside this directory, you will find subfolders organized by email account, and within those, folders named after your mailboxes (Inbox, Sent, Drafts, and any custom folders you created). The actual .emlx files sit inside Messages subfolders within each mailbox directory.

To access the Library folder, open Finder and press Cmd + Shift + G, then type ~/Library/Mail/ and press Enter. You can then navigate through the folder hierarchy to locate your emails.

The Challenge: Moving from Apple Mail to Outlook

If you are switching from a Mac to a Windows PC, or if your workplace requires you to use Microsoft Outlook, you will quickly discover that Outlook does not recognize EMLX files. There is no built-in import option for EMLX in any version of Outlook, whether desktop or online.

This creates a real obstacle for anyone who needs to migrate years of email history from Apple Mail. The folder structure, message dates, sender information, attachments, and read status are all locked inside a format that only Apple Mail can natively open.

Simply copying the EMLX files to your Windows machine does nothing useful. Outlook expects its data in PST format (Personal Storage Table), a structured database file that can contain emails, contacts, calendar items, and folder hierarchies in a single archive. Bridging the gap between these two formats requires a proper conversion process.

Convert EMLX to PST with MailtoPst

MailtoPst is the only cloud-based converter that handles EMLX to PST conversion directly in your browser. There is no software to install, no command-line tools to learn, and no intermediate format to deal with. The entire process runs on remote servers, which means you can start the conversion from Safari or Chrome on your Mac, and download the resulting PST file on any device.

Step 1: Upload Your EMLX Files

Go to mailtopst.com and upload your EMLX files. You can drag and drop individual .emlx files directly into the upload area. If you have a large number of emails to convert, you can bundle them into a ZIP archive first and upload the entire batch in one operation (more on this below).

Step 2: Choose PST as Your Output Format

Select PST as the target format. MailtoPst will process each EMLX file, parse the message content, extract attachments, and assemble everything into a properly structured PST file that Outlook can open without issues.

Step 3: Download Your PST File

Once the conversion completes, download your new PST file. You can then open it directly in Outlook on Windows using File > Open > Open Outlook Data File, or import it into Outlook on Mac, a Microsoft 365 mailbox, or any other email client that supports the PST format.

The conversion typically completes in just a few minutes, even for mailboxes containing thousands of messages.

Handling Multiple EMLX Files with ZIP Upload

Since Apple Mail stores each email as a separate file, a typical mailbox migration involves hundreds or thousands of individual EMLX files. Uploading them one by one would be impractical. MailtoPst solves this by accepting ZIP archives.

Here is the recommended workflow:

1. Navigate to your Apple Mail storage folder (~/Library/Mail/).
2. Select the mailbox folders you want to convert.
3. Right-click and choose Compress to create a ZIP file.
4. Upload the ZIP file to MailtoPst.

MailtoPst will automatically extract the archive, identify all EMLX files inside regardless of folder depth, and convert them into a single PST file. The folder structure from your Apple Mail mailbox is preserved in the resulting PST, so your Inbox, Sent, and custom folders all appear in the correct hierarchy when you open the file in Outlook.

What Gets Preserved During Conversion

MailtoPst performs a thorough conversion that maintains the integrity of your email data:

• Message content including both plain-text and HTML formatting
• All attachments regardless of file type or size
• Original dates for sent and received timestamps
• Sender and recipient information including CC and BCC fields
• Folder hierarchy matching your Apple Mail mailbox organization
• Read/unread status and message flags

Nothing is lost or simplified during the conversion. The resulting PST file is a faithful reproduction of your Apple Mail data, ready to use in Outlook.

Why Not Convert EMLX to EML First?

Some guides suggest converting EMLX files to EML as an intermediate step, since EML is a more widely supported format. While this approach can work, it adds unnecessary complexity. You would need a separate tool to strip the Apple-specific preamble from each EMLX file, then another step to import those EML files into Outlook or convert them to PST.

With MailtoPst, you skip the intermediate format entirely. Upload your EMLX files directly and get a PST file in return. One tool, one step, no wasted time.

A Cloud-Based Solution for Mac to Outlook Migration

Traditional email migration between Apple Mail and Outlook has always been complicated, requiring desktop utilities with limited compatibility and confusing multi-step procedures. MailtoPst eliminates those barriers entirely. As the only cloud-based EMLX to PST converter, it works from any browser on any operating system, with no dependencies and no installation.

If you are switching in the other direction and need to open Outlook archives on a Mac, check out our guide to opening PST files on Mac. Whether you are a professional migrating to a corporate Outlook environment, an IT administrator handling a fleet of Mac-to-Windows transitions, or an individual who simply needs to access old Apple Mail messages in Outlook, MailtoPst provides a fast, reliable, and secure conversion path.

Upload your EMLX files at mailtopst.com and complete your Apple Mail to Outlook migration in minutes.