He also teased that an official announcement would come very soon.[20] Just a week after Nadella's keynote, Microsoft started sending invites for a dedicated Windows event at 11 am ET on June 24, 2021.[21][22] Microsoft also posted an 11-minute Windows start-up sound video to YouTube on June 10, with many people speculating both the Microsoft event and Windows start-up sound video to be a reference to the name of the operating system as Windows 11.[23][24]