Poutlook Set Flag: how to

[PPCFreak]

Wirelessly posted (VZW TP2: XV6875.1 Opera/9.50 (Windows NT 5.1; U; en))

how can I set the flag on an email from the phone?

I see the option when I select the email but when you click on menu follow up all the options are greyed out (can see set flag, complete flag and clear flag).
This is outlook that is being pushed from corp exhange server if that makes a difference.
Thanks.