Microsoft Mainstream Support ended for Microsoft Dynamics SL 2011 in July 2016 and ends for Microsoft Dynamics GP 2013 in April 2018, which means no more updates, including payroll and tax updates. With each new version, upgrades become more complicated and costly. All new releases of the software are included with your annual maintenance. The benefits of unused new versions can mean loses in opportunities, cost savings, productivity and value to your business. GP 2015 mainstream support ends in April 2020. To allow enough time to upgrade before support ends next year, we recommend upgrading this year. For Microsoft Dynamics GP 2013 and prior versions, mainstream support has lapsed. This means that no more bug fixes or tax releases are available.