You could have downloaded ThunderStor 3.0.15657 from our software library for free. The most popular versions among the software users are 3.0 and 2.8. The actual developer of the software is BitDaddys Corp. The software lies within Communication Tools, more precisely E-mail Tools. Commonly, this program's installer has the following filename: thunderstor.exe.
From the developer:
ThunderStor offers the user a simple, fast and effective method to extract ThunderBird Mail from the mail box files to individual standard email message files. (requires .NET framework) Extracts Attachments (with merge option). Now with better international encoding and greatly simplified U3 usb smart drive support.
You may want to check out more software, such as Chaos Intellect, 4Team Duplicate Killer or Caretaker Antispam, which might be similar to ThunderStor.