For developers, SharePoint 2010 represented a golden era of customization. Microsoft aligned the developer experience with mainstream .NET practices, primarily through tight integration with .
Introduced Excel Services , PerformancePoint Services, and PowerPivot for advanced business intelligence and reporting.
SharePoint 2010 delivered a unified infrastructure for managing both internal intranets and external public-facing websites.
Note: SharePoint 2010 is now out of support, but this guide is useful for legacy system maintenance, migration planning, or historical study.