Translate the following question to SQL: When did the web accelerator 'CACHEbox' and browser 'Internet Explorer' become compatible?

Schema: CREATE TABLE Web_client_accelerator (
    id INT   PRIMARY KEY,
    name TEXT,
    Operating_system TEXT,
    Client TEXT,
    Connection TEXT,
    UNIQUE (id)
);

CREATE TABLE browser (
    id INT   PRIMARY KEY,
    name TEXT,
    market_share REAL,
    UNIQUE (id)
);

CREATE TABLE accelerator_compatible_browser (
    accelerator_id INT   PRIMARY KEY,
    browser_id INT   PRIMARY KEY,
    compatible_since_year INT,
    PRIMARY KEY (accelerator_id, browser_id),
    UNIQUE (accelerator_id, browser_id),
    FOREIGN KEY (browser_id) REFERENCES browser(id),
    FOREIGN KEY (accelerator_id) REFERENCES Web_client_accelerator(id)
);
user
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'
assistant