Outstanding program to compare large datasets with thousands of rows of data, and identify any changes. Beta 5 offers the ability to export the comparison analysis to a new workbook and replicate the original source worksheets within the new workbook. This allows you to hyperlink back to the source data within the same new workbook, or send the workbook to someone else and retain all the original hyperlinks back to the original source worksheets! I have tried this program on huge government databases and have found it to be one of the easiest, fastest and most accurate comparison tools available. Comparison comments are completely customizable. The developer is very easy to talk to and has incorporated some of the suggestions I have made over the past year. Overall, if you have data comparison to do over different periods of time, you can't go wrong with this tool.