private static bool UserExistsInAD(string sid)
{
ADSessionSettings sessionSettings = ADSessionSettings.FromRootOrgScopeSet();
IRecipientSession tenantOrRootOrgRecipientSession = DirectorySessionFactory.Default.GetTenantOrRootOrgRecipientSession(true, ConsistencyMode.IgnoreInvalid, sessionSettings, 103, "UserExistsInAD", "f:\\15.00.1497\\sources\\dev\\data\\src\\storage\\Auditing\\AdminAuditExternalAccessDeterminer.cs");
PropertyDefinition[] properties = new PropertyDefinition[]
{
ADMailboxRecipientSchema.Sid
};
ADRawEntry adrawEntry = tenantOrRootOrgRecipientSession.FindUserBySid(new SecurityIdentifier(sid), properties);
return(adrawEntry != null);
}