How to convert a XLSX to a ODS file?

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File extension	.xlsx
Category	Document File
Description	As part of Microsoft's 2007 Office suite of products another open XML document type was introduced. This time in the Excel sphere, Excel is known world wide. It is a powerful tool you can use to create and format spreadsheets, graphs, do complex maths and much more. You are able to create diverse spreadsheets with multiple workbooks, formulae, and various data sources. Files can be saved in the XLSX format, which is based on the Open XML format and uses ZIP compression for smaller file sizes.
Actions	XLSX Converter View other document file formats
Technical Details	XLSX improves file and data management and data recovery. XLSX extends what is possible with the binary files of earlier versions. Any application that supports XML can access and work with data in the new file format. The application does not need to be a Microsoft product it can be any application. Users can also use standard transformations to extract or repurpose the data. In addition, security concerns are drastically reduced because the information is stored in XML, which is essentially plain text. Thus, the data can pass through corporate firewalls without hindrance.
Associated programs	Microsoft Excel 2007 OxygenOffice Progessional (Linux) OpenOffice
Developed by	Microsoft
MIME type	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Useful links	More detail about the XLSX format

File extension	.ods
Category	Document File
Description	ODS was a format developed by Sun Microsystems and is used by the OpenOffice and StarOffice suites. The ODS file extension is given to files that are created with the calc program - a spreadsheet application which is XML based but contains spreadsheets, charts and other graphical elements held in rows and columns much like Microsoft Excel.
Actions	ODS Converter View other document file formats
Technical Details	The OpenDocument Format (ODF) is an XML-based file format for representing electronic documents such as spreadsheets, charts, presentations and word processing documents. The standard was developed by the OASIS (Organization for the Advancement of Structured Information Standards), and it is free and open format. OpenDocument format supports document representation: A single XML document and as a collection of several subdocuments within a package.
Associated programs	OpenOffice Calc Microsoft Office 2010 Microsoft Office 2007
Developed by	Sun Microsystems
MIME type	application/vnd.oasis.opendocument.spreadsheet application/x-vnd.oasis.opendocument.spreadsheet
Useful links	Detailed information on the ODS File Format

Using Zamzar it is possible to convert XLSX files to a variety of other formats

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