- You migrate a mailbox from a Microsoft Exchange Server 2003 server to a Microsoft Exchange Server 2010 server.
 - A user connects to this mailbox through the POP3 protocol.
 
Log Name: Application  
Source: MSExchange Common  
Event ID: 4999  
Task Category: General  
Level: Error  
Description: 
Watson report about to be sent for process id: <ID>, with parameters: E12, c-RTL-AMD64, <version number>, M.Exchange.Pop3, M.E.Data.Storage, M.E.D.S.IdConverter.GetLegacyPopUid, System.ArgumentOutOfRangeException, <stamp>, <version number>.