I am sure you have heard of Office 2013 and Office 365 by now. Microsoft Office team has done a great job with Office 2013.
So, Office 2013 has two ways to use it - online and offline.
I am actively using Office 2013 offline version (Word 2013, Excel 2013, PowerPoint 2013, SharePoint 2013 etc) and I am loving it. Learn here more about Office 2013 here >>
Today, I tried to start working with the online version of Project 2013 but again got stuck with that stupid login issue. I just don't get it. I can access my Windows 8, SkyDrive, Outlook.com, MSDN and everything else with my single email ID but freaking Office 365 has that stupid login that I can never remember.