In 2009, a research effort at MITRE implemented an OpenID 2.0 server tied to the existing corporate identity infrastructure, allowing all MITRE employees to log in to OpenID 2.0 enabled sites, both inside and outside the company's network. Follow-on research into OAuth and OpenID Connect has culminated in the creation and deployment of MITREid Connect, an open source reference implementation of these protocols. The combined MITREid platform has allowed thousands of active users to access hundreds of relying parties inside and outside the company. Come and learn about how and why we built MITREid and why we see the promotion of external identities as an important pattern for enterprise organizations.