I have designed, built, upgraded, and migrated Active Directory and Exchange environments for many organizations in the Greater Milwaukee and Chicagoland areas including large global enterprises such as Manpower, Briggs and Stratton, Northwestern Hospital, Aurora Health Care, and SC Johnson. Many small and medium sized businesses as well. My experience with Active Directory spans from its first release in 1999 (Windows 2000) through its current release, including Azure, and Azure AD. Microsoft released Exchange Server 5.5 in fall of 1997 and I completed my first implementation of it in Q1 of 1998. I have since implemented and upgraded every version of MS Exchange released. My time working in this area has resulted in the migration of approximately 500,000 mailboxes from one platform to another, approximately half of those to Office 365..