Summary

A folder of .msg files becomes something an agent can work through.

Proprietary mail formats are the reason this kind of task is still manual: nothing else opens .msg, .p7m or .olk15 in bulk. The rendering engine here is the one behind the GUI, so a batch conversion produces the same PDFs a person would have made by hand — and the files never leave the machine.

What it is

The MCP server built into CoolUtils Mail Viewer for Windows. Launched with a switch on the command line, MailViewer.exe skips the GUI and turns the program into a stdio JSON-RPC server. Everything runs locally; mail files are not uploaded anywhere.

What you get

Mail files converted using the full Mail Viewer rendering engine, from .eml, .msg, .mim, .p7m, .vmbx, .tnef, .mapixml, .olk15, .vcf, .contact and .3uc
Output as pdf, html, txt, doc, rtf, tiff, jpg, png, bmp, emf, eml or xps — PDF and DOCX preserving embedded HTML, inline images, attachment previews and message headers
A message's metadata returned as JSON: sender, To, CC and BCC, subject, date, the raw RFC headers, both plain-text and HTML bodies, and the attachment list with names, sizes and content types
Attachments extracted to a folder that is created if it does not exist, returning absolute paths and byte sizes
Reads that do not modify the source file

Requirements

Windows, with CoolUtils Mail Viewer installed — the MCP server is bundled inside the standard MailViewer.exe binary, so there is nothing extra to install. Full input and output schemas ship in the repository.