Changes

Updated on Jun 9, 2026

The following sections summarize the new features introduced in each release with links to the relevant documentation.

What Is New in 2024 Q4

• Introduced a timeout mechanism for document import and export. The new Import and Export methods for all format providers have a mandatory timeout parameter. Read more.

What Is New in 2014 Q3

New Features

• Improved import and export performance.
• Improved FillSeries performance.
• Performance optimizations for shapes and images.
• Included option to unregister a function from FunctionManager.
• Exposed API for getting the cell content size and the cell layout box from the model.

Fixes

• Setting an empty string as font family in a cell and exporting the workbook produces a corrupted document.
• Copy and paste of named ranges with isolated scope in a different worksheet refers to the source worksheet.
• Importing a document that contains a predefined Normal style causes an exception.
• Some documents cannot be imported due to the theme in use.
• Cannot import XLSX files that contain images with uppercase extensions.
• Theme-dependent fills are not updated when the theme changes.
• The currency number format is not exported correctly in cultures that contain "." or "," in the currency symbol, for example Bulgarian and Serbian.
• When the worksheet name changes from code, existing CellReferenceRangeExpressions are not updated.

What Is New in 2014 Q2

• Filtering
• Sorting
• Export to PDF
• Error cell value
• Automatic update for all defined names and cell references when the workbook name changes
• Automatic translation of cell references when cells, rows, or columns are inserted or deleted