One of the challenges that organizations have with SharePoint is with the evolution, it is a normal situation were an organization keeps the investment on the same version of SharePoint for several years, but them is faced with the product support lifecycle. This means that a specific SharePoint version will have Microsoft’s support end at a given time, so with this situation what to do with the content and applications that exist?
Read my article in LinkedIn, were I talk about this and provide some solutions.
You can find my article here: https://www.linkedin.com/pulse/sharepoint-early-versions-what-do-them-ricardo-magalh%C3%A3es/