Convert EML files to Outlook PST format and PST back to EML without Outlook installed
Free, open-source desktop and web app for Meta's Muse Code CLI
Stage
Not given
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Founded
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Based in
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Pricing model
Paid
Open source
Pricing
Free trial: 25 items per folder. Personal: $39 for one machine with one year of updates. Professional: $99 for 5 machines with lifetime updates. Technician: $299 for unlimited machines with lifetime updates. All licenses include 30-day money-back policy.
Free, MIT licensed, no paid tier, no trial, no seats, no account. Runs on your existing Muse Code subscription.
Key features
Preserve folder structure and hierarchy in output PST
Include email attachments in converted PST files
Preview emails before conversion and selectively exclude messages
Convert without Outlook installed on Windows
Support multiple email formats including EML, EMLX, HTML and RTF
Save conversion log after each batch operation
Projects and sessions grouped by working directory and git worktrees
Resume sessions including those started in the terminal TUI
Inline diffs in the thread at the turn that produced them
Every agent approval surfaced and never bypassed
Cost tracking at published API rates per thread
Full keyboard navigation with command palette
File viewer with source, Markdown, image, video and PDF preview
Remote daemon support for running the agent on another machine
VS Code extension available
Native Windows support with PowerShell
What makes it different
Bidirectional conversion: same license covers both EML to PST and PST to EML transformations
No Outlook installation required to perform conversions
30-day money-back guarantee on all license purchases
No additional cost or billing on top of existing Muse Code subscription
Credentials stay with the muse CLI, never stored by Helicon
Native Windows support without requiring WSL
MIT licensed open-source with no company behind it
ViceVersa EML to PST Converter
Helicon