The ARM-based tablets are 9.3mm (0.4 inches) thick - slightly less than the iPad. However, versions using Intel's x86 technology run Windows 8 Pro and are 13.5mm (0.5 inches) thick.
Prices and release details are yet unknown. Microsoft said the tablets will be competitively priced.
The Windows RT edition will be available with either 32GB or 64GB of storage, with the Pro edition offering either 64GB or 128GB storage.