FIX: An empty string is replicated as a NULL value when you synchronize a table to a SQL Server 2005 Compact Edition subscriber
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New and All Modifications
FIX: An empty string is replicated as a NULL value when you synchronize a table to a SQL Server 2005 Compact Edition subscriber
http://support.microsoft.com/kb/925135/en-US