Good evening Florian,
Thanks for your elaborate reply. Some really interesting thoughts I may say.
About the license key issue: too bad but that's the way it is. Hope something can be done about this as this may become a bottleneck for future developments as well.
5 ActiveSync licenses for 100 euro? I'm game should ActiveSync licenses become available at that pricepoint!
About your comment on T-mobile pricing for iPhone subscription. Yes, it's quite expensive but don't forget:
1. You get the nitty gritty iPhone as well
2. Here in Holland T-Mobile (unfortunately) has the sole right to sell the iPhone (and we're told it's all about choice huh...

)
3. The iPhone does more than just sync e-mail and calendar
My server also acts as a home file/mediaserver (through MediaPortal) and monitors my DSL line performance etc. (high geek level here...

).
So it's on anyway. Also I'm running my own domain (web and e-mail). Getting your own domain on a hosted e-mail provider is a tough route. Especially getting this at a decent price level.
Now about your Blackberry example. 10 euro/month still adds up to 120 euro per year. First of all this is too much. For ActiveSync functionality I would be willing to pay (one time) 50 euro/user max. provided that I can use this functionality for the coming 4-5 years.
Suppose I would use ActiveSync for 3 years that would come down to about 1,5 euro/month. Quite different from 10 euro/month. Also in a subscription scheme, the moment I stop paying, I loose the right to use the software. Not something I'm looking for.
I've searched for hosted Scalix solutions in the past. This was difficult since first I run my own domain and secondly I could not find one located in The Netherlands. However, this would not allow me to shut down my server so in my case this would result in additional costs. Regarding pricepoint; to me this would certainly top out at 5-10 euro per month/user.
I did a quick search for something like Microsoft Small Business Server 2008. The standard edition was offered for 345 euro excl. tax. Even though I'm not a Microsoft fan, for a complete server this is a very good price. And it includes Exchange and ActiveSync...
There is one important factor I think you should realize. People are scared by subscription scheme's. With the current economic climate even businesses are hesitant to commit to long term contracts. I know that I just did this for the iPhone but here in Holland we have no choice (maybe Nely Smit-Kroes in Brussels should have done something about this...).
Therefore I strongly believe that one could actually make a solid business case selling ActiveSync separately and for a one-time fee. And looking at all those nice app's that setup a webshop within minutes it should not be too hard a thing for you guys to accomplish...
Best regards,
Olger