It seems the subject of a (saved via drag and drop) .msg file from Outlook to a Nuxeo webDAV workspace is changed (Truncated?) if I drag and drop directly from Outlook to Nuxeo webDAV.

This truncation causes issues finding the file when I try to convert it from .msg format to .eml format using MAPIMessage msg = new MAPIMessage(content.getStream()) instantiation. Content is the file (Nuxeo Blob) and I can't find the stream associated with the Blob.

Can someone explain this to me?

See this blog for reference.