# Release Notes for Version 8.1.0

## Content

## Enhancements from the Previous Release

* Added Clone method to duplicate the workbook instance.
* Added support for adding cell addresses to exported tables in HTML.
* Added performance improvements for VLOOKUP and UNIQUE functions.

## Resolved Issues

* Fixed the issue of exception thrown on calling IWorksheet.setDataSource() method.
* Fixed the issue of incorrect sorting result of the pivot table in the exported PDF file.
* Fixed the performance issue related to calculating the UNIQUE function.
* Fixed the issue of custom object loss in the exported Excel file.
* Fixed the performance issue related to calculating the VLOOKUP function.
* Fixed the issue of hyperlink address changes after processing the template.