Hatsune Miku
Hatsune Miku was the first Vocaloid developed by Crypton Future Media after they handled the release of the Yamaha vocal Meiko and Kaito. The name of "Hatsune Miku" was conceived soon after the Vocaloid 2 announcements, when an English and Japanese vocal were developed for the character. The intended design was delayed and later used for Megurine Luka instead. Miku was intended to be the first of a series of Vocaloids called the ""Character Vocal Series"", which included Kagamine Rin/Len and Megurine Luka. Each had a particular concept and vocal direction.
Vocaloid 3
Hatsune Miku had two releases for the Vocaloid 3 software. The first was a new English vocal released on August 31, 2013. The second release was an update on the Vocaloid 2 vocal, it contained 5 vocals, 4 of which were updated versions of 4 of the 6 Hatsune Miku append package vocals ("sweet", "dark", "solid", "soft"). There were two versions of the software released, one with and one without the English version included. It was released on September 26, 2013. Like Kaito before her, she also came with Piapro Studio.
The missing vocals from the Append package ("light" and "vivid") were originally offered for free as part of an early promo for those who had the Vocaloid 2 version and the Vocaloid 3 version of the Hatsune Miku vocals. They were later sold separately on the Japanese version of the on-line store Sonicwire.