Moving messages from Thunderbird to Outlook Express and Outlook

"Even though Mozilla Thunderbird is a fantastic email client, there are people who (for one reason or another) need to switch back to Microsoft Outlook Express (OE) or Outlook. However, Thunderbird still doesn't have an "Export" feature which would export mail archives in a format understandable by OE or Outlook. IMAPSize can be of great help in this process and this page explains how to perform the migration."

Follow the instructions here