Microsoft today released new updates for the Office Mobile apps (Word, Excel, PowerPoint and OneNote) in Windows Store. This seems to be a minor update with no new features. Recently, Microsoft added support for the ability to annotate with ink. You can use your pen or finger to write, draw, and highlight with the tools on the new Draw tab on these apps. Also, Microsoft now allows you to pin files to Start menu to keep them handy.
You can download the latest updates from the links below.