Fix on: If you want to add another user with some specific Public folders

permission during PF creation, it crashes with information that \user@domain.com
 does not exist. There is unwanted "\" character before user's UPN.

Fix on:  You can create new public folder, can see in Public Folder Management
Console that it was created OK, with correct implicit rights (Anonymous = Create
 items, Default = None, my.hosted.org = Reviewer). But you are not able to see
 this Public Folder in WebsitePanel. Cannot add other accounts because there is
 nothing to choose.

 Applied fix:
 if account contains a '@' no '\' will be applied

 GetExchangeAccounts sp modified: LEFT OUTER JOIN instead of INNER JOIN

WebsitePanel/Database/update_db.sql

@@ -2332,7 +2332,7 @@ SELECT
 	E.SubscriberNumber
 FROM
 	ExchangeAccounts  AS E
-INNER JOIN ExchangeMailboxPlans AS P ON E.MailboxPlanId = P.MailboxPlanId		
+LEFT OUTER JOIN ExchangeMailboxPlans AS P ON E.MailboxPlanId = P.MailboxPlanId		
 WHERE
 	E.ItemID = @ItemID AND
 	(E.AccountType = @AccountType OR @AccountType IS NULL)