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GOAL: move data from SQL Server to Excel with SQL Server Integration Services.
PROBLEM: the package doesn't work and you receive the error "cannot convert between unicode and non-unicode".
- Add a Data Conversion task between Source and Destination in your Data Flow Task.
- Inside the Data Conversion task convert all the string field to "Unicode string [DT_WSTR]":
- In the Mappings page of the Excel destination task, remap the fields taking the new converted columns instead of the original ones from the Available Input Columns.