If the security issues is 99-025 and the distribution mechanism is the Microsoft website, what is the release date total number?
CREATE TABLE "table1_2263152_1" (
  "version" text,
  "release_date" text,
  "distribution_mechanism" text,
  "features" text,
  "security_issues" text
);
SELECT COUNT("release_date") FROM "table1_2263152_1" WHERE "security_issues"='99-025' AND "distribution_mechanism"='Microsoft website';