This documentation archive contains links to help systems for older products and apps.
Not all products and apps have web help available. Installed help is always accessible, though.
Using ArcGIS 10.5, 10.4, or 10.3? Or ArcGIS Pro? Click here.
Product and Solution Help
ArcGIS Explorer Online Help
Business Analyst Desktop Help
Business Analyst Server Help
Geoportal Extension/Geoportal Server Help
ArcGIS Viewer for Flex Help
ArcGIS API for Silverlight Help
ArcGIS Viewer for Silverlight Help
ArcGIS for SharePoint Help