Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_14465871_2 ( provider VARCHAR, application VARCHAR )

### Question ###
Which providers use exchange server?

### Accurate SQL ###

SELECT provider FROM table_14465871_2 WHERE application = "Exchange Server"