MessageClass property

[Bingo]

I'm using Outlook Object to change the MessageClass of
emails to the custom form I created. Once the property
is changed, I save all the emails. I know this was done
correctly since when I open these emails, I can see the
custom fields I added. But when I retrieve these changed
emails again and check their MessageClass, they are all
back to the default, IPM.Note! I'm not sure where the
problem is. Thanks.