MSG to EML Converter

This tool converts Outlook MSG messages into RFC 822 compliant EML files for broad client compatibility. It preserves headers, the email body, and attachments, enabling smooth imports into Thunderbird, Apple Mail, or webmail platforms. The conversion is deterministic and schema-aligned, ensuring predictable results across environments. It is suitable for IT admins performing migrations, help desks archiving messages, and developers integrating email workflows into data pipelines. The process is grounded in standard MIME and header handling to minimize surprises when imported into diverse clients. The operation is file-based and atomic, producing a single .eml per input when configured.
The core transformation maps MSG components to an EML structure, validating the resulting MIME as RFC 5322 compliant. When both text/plain and text/html exist, the tool creates a multipart/alternative body to maximize compatibility and readability across clients. Attachments are encoded as base64 MIME parts with appropriate Content-Type and Content-Disposition, ensuring fidelity and accessibility. Time stamps are preserved from the original message, with date formatting aligned to RFC 5322. The tool does not reinterpret or encrypt content; it focuses on faithful syntactic and semantic representation of the original message.
Audience includes migration engineers, help desk operators, and developers seeking reliable mail interoperability. The unique value lies in strict MIME compliance, explicit input definitions, and clear output guarantees for single-file conversion scenarios. Core features are prepared for extension to batch use cases and advanced header customization without altering the fundamental conversion semantics.