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I believe that we have been using SM since V8 and are currently using V15 on a dedicated server which also runs all of our clients web-sites together with SQL Server.
Some weeks ago I made the decision to purchase a new dedicated server dedicated solely to SM16, in the believe that SM16, after all the wait, was finally stable.
The new server is far superior (CPU/RAM/OS/SSD etc.) than the old server but SM16 (latest hotfix) is not running at half the speed then SM15 on the old server, albeit that one had much more load.
My initial idea was to slowly move all domains to the new server and I had asked ST for a 30 day Trial License which was provided.
Albeit having created a few internal domains/users for internal testing we have actually, in 3 weeks, not moved any client to the new server aka SM16, due to all the problems and bugs reported.
It seems that we will have to ask ST for another Trial License, but in the meantime the new, useless server is costing us more then €300 per month!