Great but...
As someone already mentioned – great app but it makes my MBP 13” early 2011 burn. CPU is getting really hot (94*C~200*F). Also uses quite a lot bandwith and it’s sluggish when refreshing IMAP folder. It can take minutes before emails are sychnronised again. It looks like Unibox was trying get all the mails to local cache again despite it has been done days before. You should do something with it.
Hall Papami about
Unibox, v1.0