Does Bates Gmail have a “tasks” feature that lets me add messages to a list for follow up?

Yes, the Google Tasks gadget is available in Bates Gmail and Calendar.
Just click the Tasks link in the pane on the left to open the Tasks gadget. Use the gadget to create one or more task lists. To add an email message to a tasks list, open the message and then click More actions > Add to Tasks. The subject of the message appears at the top of your tasks list, with a link to the message content.