Ask HN: What is Microsoft ESE?

I applied for a Software Engineering internship at Microsoft and was rejected. However, they've offered me an interview for an ESE (service engineering) internship instead.

Is anyone familiar with this position? I've read through the description they've sent me, but I'm still not exactly sure what it entails. I really want to go into software engineering, so I'm not sure if this would be the best fit for me.

Link: http://imgur.com/nYf5G9H