What ODBC Driver do I need for ArcSDE 8.0.2?
None. ArcSDE 8.0.2 uses OLE-DB to access the MS SQL Server Data Store. You only need an MDAC (Microsoft Data Access Components) pack. If you have version 2.10.4202.1 of the MSADO15.dll file, you have the correct version of MDAC installed (this version of MDAC is installed by default by desktop ArcInfo 8.0.2). Alternatively, download version 2.1.2.4202.3(GA) from the www.microsoft.com/data web page.