Licensing
Microsoft significantly changed the licensing model for Dynamics GP 2013. In Dynamics GP 2010, for example, accessing GP data via Microsoft Excel required paying for at least a "Light User" license. There was a lot of confusion in the community around what types of activities would require additional licenses to access Dynamics GP data from outside the application. Information from Microsoft was often confusing and contradictory. Users complained that they already had a license to access the data in their SQL server via their SQL Client Access License (CAL).
While staunchly defending their "Light User" license, Microsoft did make a change for Dynamics GP 2013 and has significantly simplified the licensing. Accessing Dynamics GP data from applications such as Excel now only requires an SQL Server CAL.