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https://help.tallysolutions.com/docs/te9rel66/Data_Management/odbc_driver.htm

[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

Cause:

This error message appears when you try to extract data from Tally.ERP 9 to MS Excel through ODBC and Tally.ERP 9 was not opened in administrator mode (Run as administrator).

Solution:

1. Close Tally.ERP 9 application.

2. Right click on tally.exe file, click Run as administrator as shown below:

3. Open MS Query from MS Excel and choose any one of the configured port.

4. Now you will be able to extract data from Tally.ERP 9 through ODBC.