if you're a windows host, what email server are you using and which one do you recommand to buy?

i'm currently using Mail Enable Standard with ubeimiau. i'm looking for a new email server software since ubeimiau is pretty much a dead project. i've come down to Smtarter Mail and Mail Enable.

Smarter Mail have more features but cost more if i want unlimit domain and users. while Mail Enable Pro cost around $200 but from what i understand it only support English for webmail.

does anyone use Smarter mail and Mail Enable? which one do you perfer?