Microsoft has finally released its latest iteration of its Windows-branded software: Windows 8. The next-generation operating system represents the company’s first major step towards a unified, mobile-centric platform.

The long-time PC software manufacturer also launched its Surface tablet at midnight on Oct. 26, with Microsoft retail locations around the country celebrating the release of its first self-branded tablet.

Windows 8 will be available in both hard copy and digital form, and users have the option of purchasing it online or in stores. Below is a list of all options available for upgrading to Windows 8.

PRICE: In Store vs. Online

On Microsoft’s official website, users can download Windows 8 Pro for a price of $39.99. An Upgrade Assistant will prompt users when installing the software to inform users if they’re PC is ready for the update. The assistant will also walk users through the necessary steps to purchase, download and install Windows 8. For those running on Windows 7, files, apps and settings will easily transfer to Windows 8 Pro. However, those using Windows XP or Vista will need to reinstall previous apps.

 Windows 8 Professional will be on sale at Best Buy beginning tomorrow for a price of $69.99. The electronics retailer will also be offering demos and advising from staffers that have been trained on Windows 8 features, as well as exclusive Windows 8 PCs. Windows fans can also purchase the new software at Microsoft retailers for $69.99. For a list of Microsoft stores near you, see the official list here.

UPGRADES: Special Offers

Months ago, Microsoft announced that users can score Windows 8 for a lowered price of $14.99. Any customer who purchases a Windows 7 PC between June 2, 2012 and Jan. 31, 2013 can register for the offer at windowsupgradeoffer.com before Feb. 28, 2013. Microsoft will then send an email with a promotion code and purchase instructions following Windows 8’s release.

This is certainly a reasonable price for Microsoft’s new OS, but users may be paying a larger expense in the long term. Those who participate in this offer will be getting Windows 8 at close to nothing, but are giving up the option to take advantage of the new hardware created for the operating system. In the final weeks leading up to Windows 8 release, manufacturers such as Lenovo, Acer, Asus and Samsung have been showing off their touchscreen enabled, convertible laptops. Microsoft spent a large chunk of Thursday’s keynote showcasing Windows 8 on these new PC-tablet hybrids, emphasizing the enhanced user experience these devices bring to the software.

For a list of some of the cheapest convertible tablets, see our guide here.

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