The sources to Incrediconvert has unfortunately been lost.
With the sources my documentation of the reverse engineering also were lost.

The IncrediMail mailbox format is really a no-brainer, it is quite easy to reverse engineer.
How ever; I have no plans doing so, unless paid for.

Please note that Incrediconvert only works with Windows 2000 and Windows XP.

As of 2007, the IncrediMail file format seems to have been changed. This version doesn't support the new file format.