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from my sympa.conf file i find that line 
"Database type (mysql | Pg | Oracle | Sybase)"

Are that 4 types of databases that are ONLY the 4 databases types that are 
supported by SYMPA , or SYMPA support more than these types (Like 
MicrosoftSQL)

i can giv the sympa the following variables
db_name         (my_MSSQL)
db_host         (my_MSSQL_HOST)
db_user         (my_MSSQL_USER)
db_password     (my_MSSQL_PASSWORD)

but the variable "db_type" i don't know it
shall i write "MSSQL" ??
or SYMPA is not working on MicrosoftSQL (MSSQL) ???

some one help me plz