Hotmail quickly gained in popularity as it was localized for different markets around the globe, and became the world's largest webmail service with more than 30 million active members reported by February 1999.
Hotmail, dünyadaki farklı pazarlara göre yerelleştirmede hızla popülerlik kazandı ve Şubat 1999'da 30 milyondan fazla aktif üyeyle birlikte dünyanın en büyük web posta hizmeti haline geldi.