This document summarizes the key differences between various versions of the accounting software Tally. It describes Tally 4.5, the first DOS-based version, Tally 5.4 which introduced a graphical interface, and Tally 6.3 which was the first truly windows-based version with features like VAT implementation. It then discusses newer versions like Tally 7.2, 8.1 and 9, highlighting improved statutory features, integration of payroll and other modules, and the addition of advanced accounting capabilities in the latest version.