Has anyone looked at either of the following
I am looking for an alternative to SBS to offer small businesses. The key points are point and click manageability for everyday tasks such as adding users, mail account administration etc, Simple deployment, and inter-operation with Outlook (preferably with most if not all features supported (public folders, calendar sharing etc etc.)
As to the other SBS features, VPN's, File and Print sharing and some thing to replace sharepoint I already know how to do quite well in linux so the only missing link is a point and clicky administration interface (some of which is filled by webmin) but these are secondary requirements to the Exchange like functionality.
Open-Xchange looks to be pretty suitable, however the GPL version is a complete pig to install unless you are running SuSE or Redhat enterprise products. Also it is pretty dependant on the paid version (with closed source additions) to get the desired functionality (too much dependence on closed source additions puts me in the same boat as SBS and if I include Redhat or SuSE server products, puts me in at the same or higher price point)
However I would be interested to hear of any experience with these (or any other similar) products.