CREATE TABLE table_2263152_1 (release_date VARCHAR(255), security_issues VARCHAR(255), distribution_mechanism VARCHAR(255))
If the security issues is 99-025 and the distribution mechanism is the Microsoft website, what is the release date total number?
    
SQL: SELECT COUNT(release_date) FROM table_2263152_1 WHERE security_issues = "99-025" AND distribution_mechanism = "Microsoft website"