When you receive an email message that contains voting buttons, you can quickly respond to the sender's request for a vote.
Note: This feature requires a Microsoft Exchange Server account.
To vote, do one of the following:
In the Reading Pane, click the InfoBar, and then click your choice.
Open the message, and on the Home tab, in the Respond group, click Vote, and then click your choice.
You are prompted to choose whether you want to include a message together with your vote before the response is sent.