When did the web accelerator 'CACHEbox' and browser 'Internet Explorer' become compatible?
SELECT T1.compatible_since_year FROM accelerator_compatible_browser AS T1 JOIN browser AS T2 ON T1.browser_id  =  T2.id JOIN web_client_accelerator AS T3 ON T1.accelerator_id  =  T3.id WHERE T3.name  =  'CACHEbox' AND T2.name  =  'Internet Explorer'
web accelerator 'CACHEbox' refers to T3.name = 'CACHEbox'; browser 'Internet Explorer' refers to T2.name = 'Internet Explorer'; when they became compatible refers to T1.compatible_since_year; JOIN is used to combine rows from two or more tables based on a related column between them;