I haven't applied that hack for a while. I haven't found the need since upgrading to the newer phones. It should work on WinMo6, but I can't say for sure.
What phone do you have? Are you actually running out of space because of this?
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"I have no special talents, I am only passionately curious" - Albert Einstein
I have the HTC 5800. I am not running out of space right now, but I often get pretty large email attachments, so I only takes 2 or 3 of those emails to take up all of the available space.
Did you know of any software that performs this hack?