system
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40 Mo of ram per MSDE instance I am not sure it is a good way. I prefer to give more cache ram to my main SQL Server instance than to spend ram on 2 ou 3 instance of MSDE especially on small number of PC around SBS. In this case SBS is not full of ram 
I just finish my install on SQL Server I run AMS Consol and I don’t have anything on the list of Server to login. What is the trouble ?
Thank’s for first answer.
Best Regards.
GG.