Microsoft provides a JDBC driver that will allow you to connect from a variety of operating systems - you can find the home page at http://msdn2.microsoft.com/en-us/data/aa937724.aspx.
Note that from the system requirements page at http://msdn2.microsoft.com/en-us/library/ms378422.aspx, it's stated that Sun Solaris, Red Hat Linux and Microsoft Windows 2000 or later are the officially supported operating systems.
Microsoft has a Linux ODBC driver here:
Unfortunately, it targets RH5, so it may not work for SLES9 without jumping through hoops.
Hope that helps,
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