I like how easy it was to set up my email accounts so I could start using them immediately without having to worry about waiting weeks while they get setup as I did when switching from Google Apps. Also liked how easy it was to switch back if needed. The customer service is not great. They're very slow at updating their knowledge base articles which means you have to ask other people questions instead of reading the article yourself. If you want hosted webmail which looks nice and feels comfortable, this works well. Not much else to say. We use it primarily for our internal mail but also occasionally make use of it externally.