Thats great to hear. I have seen a lot of hosted customers looking to add on Exchange hosting. It seems to make sense to get your feet wet with an already established private labeled solution first and then either grow into your own or expand your commitment with your partner.
What other private labelers have people used? Have anyone had a bad experience with one? (I don't want this to be a rant but maybe we can try to identify what they can do better)
The resellers that I know are:
Are there others that I a missing?