The Apple Watch goes on sale around the world on Friday.
Windows 10, which comes almost three years after the launch of the company's last operating system, will be available in 190 countries.
Microsoft Corp announced its 'Windows 10' operating system on Tuesday to replace the largely unpopular Windows 8, skipping a number to mark a leap toward unifying the way people work on tablets, phones and traditional computers.
Despite the slowdown, Apple remains the most profitable company in the S&P 500 and the most valuable publicly traded US tech company
Industry analysts were broadly excited at the prospect, but sceptical that it could produce a working model at a mass-market price that soon.
Ellison and the two new co-CEOs each stressed that nothing would change under the new management structure, with Ellison staying on as executive chairman and chief technology officer.