Microsoft has announced that interested customers can now reserve an upgrade edition of Windows 8 Pro starting today.

Customers can also start pre-ordering computers loaded with Windows 8 that would go on sale after the launch later this month.

The company also released photos of the box art for the retail copies of Windows 8 Pro.

Microsoft is also going to offer an online update for customers with an existing Windows powered machine from later this month.

The company said:

However, if you want to wait until October 26th you will be able to upgrade online via Windows.com using the Windows 8 Upgrade Assistant for just $39.99 USD ERP*. Online upgrade to Windows 8 Pro is supported for 140 countries worldwide, with 37 languages, and 23 supported currencies! You will want to upgrade your PC to Windows 8 Pro sooner rather than later - this upgrade promotion for Windows 8 Pro both online and at retail runs only through to January 31st, 2013.