Microsoft have done many great things over the years but have also made some bad (maybe awful) decisions in my opinion. This includes discontinuing Zune and Windows Phone and Xbox Kinect as well as the addition of Clippy to Office or the removal of the Start Menu in Windows 8.
However, the latest change that I am less than impressed by is the changing of the default Office font (technically Typeface) from Calibri to Aptos. This article explains how to restore Calibri as the default in Microsoft Outlook.
Winthrop Development Consultants Blog 