Here's the syntax definition from 2005. It does not support the 4 part naming convention. This came from BOL you could check on line for the 2008 version on MSDN. I'm guessing that it has not changed with 2008.
BULK INSERT
[ database_name . [ schema_name ] . | schema_name . ] [ table_name | view_name ]
FROM 'data_file'
[ WITH ..............