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Will Jomsocial work on the basis of MSSQL?
Do you mean Mysql?
Jomsocial install on the Joomla, that needs Mysql :
in Jomsocial MySQL 5.1 or above (5.5.3 for Emoji support).
Here you can see the tech requirements:
JomSocial is the most complete, easy-to-use addon that turns Joomla CMS into a full -fledged, social networking site