What is an appropriate use for voting buttons?
Use when you need an authorization for an action. For example, you can send an email request to several recipients seeking their approval of a project proposal. Use when you need either a yes or a no. This is a good way to take a quick poll.
How many voting buttons are allowed?
If you have more than 32 voting buttons in a message, Outlook discards all of them without any warning to the user.