First download Microsoft Exchange Server Information Store Viewer here:

 www.microsoft.com/downloads/details.aspx

1. Open Microsoft Exchange Server Information Store Viewer
2. Open default Message Store, select the default pst file, press "Open".
3. Double click the "Read:hello" under  “Messages in Folder”.
4. Select the “Read” message.
5. On the selected message – Browse the "Operations available" to select lpMDB->AbortSubmit()
6. Press Call Function and then OK
7. On the selected message – Browse the "Operations available" to select lpFld->DeleteMessages()
8. Press Call Function and then OK. The “Messages in Folder” pane should now be empty now.