Rated 2 out of 5 stars

Follow up works well as far as it goes. However, there are a couple of shortcomings that make it seem amateurish.
For example: creating a tag for every single day you have a follow up. I have many follow ups and don't want a zillion tags (especially since I can't pick the color).
The event it creates is too generic. You can see you have a follow up, but for what. Even if the event contained the subjects and senders, this would give you some idea why you're following up. Better yet, would be a link directly to the message.

Like I said, does what it says.