October 26: It's the day Windows 8 and Windows RT tablets and PCs are available for retail purchase. It's also the day that a number of Microsoft-developed apps for the new platforms are downloadable in final form.
The new, free Windows 8/Windows RT Lync and OneNote apps are available in the Windows Store as of today.
Read more at source:
Microsoft's Lync and OneNote apps for Windows 8, Windows RT now in Windows Store | ZDNet
See also:
How to Install Metro Apps from Windows 8 Store