Microsoft 365 E3

Microsoft 365 E3 is the standard enterprise plan: the full Office applications, enterprise-grade Exchange and SharePoint, Windows Enterprise upgrade rights, Intune, and the compliance tooling that regulated organisations need for retention and eDiscovery.

Unlike the Business plans, E3 has no seat cap, which makes it the destination for organisations that have outgrown Business Premium. The compliance capabilities — litigation hold, retention policies, data loss prevention — are usually what forces the move rather than the seat count alone.