Outlook express crash after compating

Problem: How to disable "To free up disk space, outlook express can compact messages. This may take up to a few minutes."

regedit-
\HKEY_CURRENT_USER\­Identities
something like "{63682237-R041-496B-8388-091T5LS7348F}" \­Software\­Microsoft\­Outlook Express\5.0.
and then find
Compact Check Count
type 0

After 100 times of opening and closing OE, message will appear again.