The software giant is currently preparing final milestone builds of Office 15 in preparation for a full beta in late January, according to sources familiar with the company’s plans. Microsoft Office 15, the codename for the next version of Microsoft’s popular productivity suite, is tentatively scheduled for a beta 1 milestone in late January. Microsoft will provide a Technology Preview of the software initially, expected at CES 2012 alongside the Windows 8 beta. Office 15 will be designed with touch at the heart of the applications. Microsoft has redesigned the general look and feel of its popular Outlook email client to make it usable by touch, pen and mouse.