The only real difference is that opening in openGL GE is using the memory that is dedicated on your graphics card, not your system resources.f you computers graphic card has to use you systems memory (RAM) then you would open using DirectX. This is microsofts way of letting you enjoy the 3D effects of many programs. When you first install and run GE for the first time, it should tell you which mode to open in and then set it as your default.
In July 2014, Microsoft announced plans to lay off 18,000 employees. Microsoft employed 127,104 people as of June 5, 2014, making this about a 14 percent reduction of its workforce as the biggest Microsoft lay off ever. It will include 12,500 professional and factory personnel.
The installation base of Microsoft Office is about 1 billion. This figure can be found in many articles. On July 7, 2014 Microsoft reported that over 1.1 billion people use Microsoft Office. So the estimated base of Microsoft Outlook users in 2014 is between 500m and 600m. According the Google Trends, in the USA we can see decreasing interest in Microsoft Outlook in the last 10 years: