Index: branches/5.2.x/core/install/install_schema.sql
===================================================================
diff -u -N -r14437 -r14447
--- branches/5.2.x/core/install/install_schema.sql	(.../install_schema.sql)	(revision 14437)
+++ branches/5.2.x/core/install/install_schema.sql	(.../install_schema.sql)	(revision 14447)
@@ -237,7 +237,7 @@
 
 CREATE TABLE PortalUser (
   PortalUserId int(11) NOT NULL AUTO_INCREMENT,
-  Login varchar(255) DEFAULT NULL,
+  Login varchar(255) NOT NULL,
   `Password` varchar(255) DEFAULT 'd41d8cd98f00b204e9800998ecf8427e',
   FirstName varchar(255) NOT NULL DEFAULT '',
   LastName varchar(255) NOT NULL DEFAULT '',
@@ -267,16 +267,17 @@
   DisplayToPublic text,
   UserType tinyint(4) NOT NULL,
   PrimaryGroupId int(11) DEFAULT NULL,
+  OldStyleLogin tinyint(4) NOT NULL,
   PRIMARY KEY (PortalUserId),
   UNIQUE KEY ResourceId (ResourceId),
-  UNIQUE KEY Login (Login),
   KEY CreatedOn (CreatedOn),
   KEY `Status` (`Status`),
   KEY Modified (Modified),
   KEY dob (dob),
   KEY IsBanned (IsBanned),
   KEY AdminLanguage (AdminLanguage),
-  KEY UserType (UserType)
+  KEY UserType (UserType),
+  KEY Login (Login)
 );
 
 CREATE TABLE PortalUserCustomData (