Hi Luis,
I didn't say there is no solution, only that because I don't use Outlook I don't have the means of testing the solutions that work in other contexts to check what works & what doesn't work with HTML email merges.
Another approach that might work is to not use mailmerge, but to write an Outlook macro that achieves the same results. Again, because I don't use Outlook, I can't help you there. For help on that front, you might try asking at an Outlook-specific forum such as Outlook Forums, at:
http://www.outlookforums.com/.