Yes it is. Take a look at the project discussed in the link below. This project will pull the comment / messages for the incident. We discovered an issue with the component to pull the comments that it requires you to pull all the data & not just comments, so you'll have to do a little data manipulation to get the ones you want.
https://www-secure.symantec.com/connect/downloads/send-incident-workflow-automation-rule-example-notifying-users-comment-added