how do i stop the annoying pop up which states To free up disk space OE can compact messages

[alanrx1]

"To free up disk space Outlook Express can compact messages" etc etc . how can I stop this constanly popping up even aftert I have done what it says.
I use XP

 

[Chicano]

How to remove the low disk space warning
http://support.microsoft.com/kb/555622

 

[Chicano]

How to remove the low disk space warning
http://support.microsoft.com/kb/555622

Instructions with pitures
http://www.wikihow.com/Turn-off-the-Low-Disk-Space-Warning