Unless your clients all have Outlook, voting buttons will be useless. If they do, the results will be tallied on the Tracking tab of the message you sent, as long as it stays in the Sent Items folder.
will everyone be using outlook? if so, the votes will tally as long as the
tnef wrapper isn't destroyed by the mail server. if it is, or if they don't
use Outlook, then you'll need to tally the results yourself.
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Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Coauthor, OneNote 2003 for Windows (Visual QuickStart Guide)
Author, Google and Other Search Engines (Visual QuickStart Guide)