OK guys, I have just finished my second small office install of Scalix. I upgraded the first install to 10 just today.
after having them run for a while, I asked both clients for feedback. here is the gist of what both clients said after the switch from Exchange to Scalix:
We haven't noticed a change except that it works!
that is a big compliment to Scalix. to be considered as good as Exchange (actually better because there are no regular failures to the message store like exchange has). to be able to rip the messaging infrastructure and replace it with a different product and have everything work as good as or better than that of the replaced product, that's amazing. the only problem I have with it is that I have noticed a severe drop in service calls for their email server meaning a drop in revenue for me. :( . I guess I'll get over that as long as my customers are happy.