In this config you can learn how to convert documents format between LibreOffice and Microsoft Office file formats on Linux. The preferred tool to use for a file format conversion between LibreOffice and Microsoft Office is unoconv. Let's start with the installation of unoconv package:
FEDORA/REDHAT/CENTOS
# yum install unoconv
DEBIAN/UBUNTU
# apt-get install unoconv
and create some LibreOffice document document.odt and spreadsheet spreadsheet.ods to play with:
$ file document.odt 
document.odt: OpenDocument Text
$ file spreadsheet.ods 
spreadsheet.ods: OpenDocument Spreadsheet
The unoconv command is capable to convert between various file formats. To see a list of all supported file format by unoconv run:
$ unoconv --show
The following list of document formats are currently available:

  bib      - BibTeX [.bib]
  doc      - Microsoft Word 97/2000/XP [.doc]
  doc6     - Microsoft Word 6.0 [.doc]
  doc95    - Microsoft Word 95 [.doc]
  docbook  - DocBook [.xml]
  docx     - Microsoft Office Open XML [.docx]
  docx7    - Microsoft Office Open XML [.docx]
  fodt     - OpenDocument Text (Flat XML) [.fodt]
  html     - HTML Document (OpenOffice.org Writer) [.html]
  latex    - LaTeX 2e [.ltx]
  mediawiki - MediaWiki [.txt]
  odt      - ODF Text Document [.odt]
  ooxml    - Microsoft Office Open XML [.xml]
  ott      - Open Document Text [.ott]
  pdf      - Portable Document Format [.pdf]
  rtf      - Rich Text Format [.rtf]
  stw      - Open Office.org 1.0 Text Document Template [.stw]
  sxw      - Open Office.org 1.0 Text Document [.sxw]
  text     - Text Encoded [.txt]
  txt      - Text [.txt]
  uot      - Unified Office Format text [.uot]
  xhtml    - XHTML Document [.html]

The following list of graphics formats are currently available:

  bmp      - Windows Bitmap [.bmp]
  emf      - Enhanced Metafile [.emf]
  eps      - Encapsulated PostScript [.eps]
  fodg     - OpenDocument Drawing (Flat XML) [.fodg]
  gif      - Graphics Interchange Format [.gif]
  html     - HTML Document (OpenOffice.org Draw) [.html]
  jpg      - Joint Photographic Experts Group [.jpg]
  met      - OS/2 Metafile [.met]
  odd      - OpenDocument Drawing [.odd]
  otg      - OpenDocument Drawing Template [.otg]
  pbm      - Portable Bitmap [.pbm]
  pct      - Mac Pict [.pct]
  pdf      - Portable Document Format [.pdf]
  pgm      - Portable Graymap [.pgm]
  png      - Portable Network Graphic [.png]
  ppm      - Portable Pixelmap [.ppm]
  ras      - Sun Raster Image [.ras]
  std      - OpenOffice.org 1.0 Drawing Template [.std]
  svg      - Scalable Vector Graphics [.svg]
  svm      - StarView Metafile [.svm]
  swf      - Macromedia Flash (SWF) [.swf]
  sxd      - OpenOffice.org 1.0 Drawing [.sxd]
  tiff     - Tagged Image File Format [.tiff]
  wmf      - Windows Metafile [.wmf]
  xhtml    - XHTML [.xhtml]
  xpm      - X PixMap [.xpm]

The following list of presentation formats are currently available:

  bmp      - Windows Bitmap [.bmp]
  emf      - Enhanced Metafile [.emf]
  eps      - Encapsulated PostScript [.eps]
  fodp     - OpenDocument Presentation (Flat XML) [.fodp]
  gif      - Graphics Interchange Format [.gif]
  html     - HTML Document (OpenOffice.org Impress) [.html]
  jpg      - Joint Photographic Experts Group [.jpg]
  met      - OS/2 Metafile [.met]
  odg      - ODF Drawing (Impress) [.odg]
  odp      - ODF Presentation [.odp]
  otp      - ODF Presentation Template [.otp]
  pbm      - Portable Bitmap [.pbm]
  pct      - Mac Pict [.pct]
  pdf      - Portable Document Format [.pdf]
  pgm      - Portable Graymap [.pgm]
  png      - Portable Network Graphic [.png]
  potm     - Microsoft PowerPoint 2007/2010 XML Template [.potm]
  pot      - Microsoft PowerPoint 97/2000/XP Template [.pot]
  ppm      - Portable Pixelmap [.ppm]
  pptx     - Microsoft PowerPoint 2007/2010 XML [.pptx]
  pps      - Microsoft PowerPoint 97/2000/XP (Autoplay) [.pps]
  ppt      - Microsoft PowerPoint 97/2000/XP [.ppt]
  pwp      - PlaceWare [.pwp]
  ras      - Sun Raster Image [.ras]
  sda      - StarDraw 5.0 (OpenOffice.org Impress) [.sda]
  sxd      - OpenOffice.org 1.0 Drawing (OpenOffice.org Impress) [.sxd]
  sti      - OpenOffice.org 1.0 Presentation Template [.sti]
  svg      - Scalable Vector Graphics [.svg]
  svm      - StarView Metafile [.svm]
  swf      - Macromedia Flash (SWF) [.swf]
  sxi      - OpenOffice.org 1.0 Presentation [.sxi]
  tiff     - Tagged Image File Format [.tiff]
  uop      - Unified Office Format presentation [.uop]
  wmf      - Windows Metafile [.wmf]
  xhtml    - XHTML [.xml]
  xpm      - X PixMap [.xpm]

The following list of spreadsheet formats are currently available:

  csv      - Text CSV [.csv]
  dbf      - dBASE [.dbf]
  dif      - Data Interchange Format [.dif]
  fods     - OpenDocument Spreadsheet (Flat XML) [.fods]
  html     - HTML Document (OpenOffice.org Calc) [.html]
  ods      - ODF Spreadsheet [.ods]
  ooxml    - Microsoft Excel 2003 XML [.xml]
  ots      - ODF Spreadsheet Template [.ots]
  pdf      - Portable Document Format [.pdf]
  slk      - SYLK [.slk]
  stc      - OpenOffice.org 1.0 Spreadsheet Template [.stc]
  sxc      - OpenOffice.org 1.0 Spreadsheet [.sxc]
  uos      - Unified Office Format spreadsheet [.uos]
  xhtml    - XHTML [.xhtml]
  xls      - Microsoft Excel 97/2000/XP [.xls]
  xls5     - Microsoft Excel 5.0 [.xls]
  xls95    - Microsoft Excel 95 [.xls]
  xlt      - Microsoft Excel 97/2000/XP Template [.xlt]
  xlt5     - Microsoft Excel 5.0 Template [.xlt]
  xlt95    - Microsoft Excel 95 Template [.xlt]


By default all documents are converted to PDF. Use --format option to change the output file format to any above listed formats. Unoconv's -d is used to explicitly specify document type eg. document, graphics, presentation and spreadsheet. What follows are few examples how to convert between LibreOffice and Microsoft Office document and spreadsheet file formats.

Convert document ODF to DOCX

$ unoconv -d document --format=docx document.odt 
$ file document.docx 
document.docx: Microsoft Word 2007+

Convert document ODF to DOC

$ unoconv -d document --format=doc document.odt 
$ file document.doc
document.doc: Composite Document File V2 Document, Little Endian, Os: Windows

Convert spreadsheet ODS to XLS

$ unoconv -d spreadsheet --format=xls spreadsheet.ods 
$ file spreadsheet.xls 
spreadsheet.xls: Composite Document File V2 Document, Little Endian, Os: Windows

Convert document DOCX to ODF

$ unoconv -d document --format=odt document.docx
$ file document.odt 
document.odt: OpenDocument Text

Convert spreadsheet XLS to ODS

$ unoconv -d spreadsheet --format=ods spreadsheet.xls 
$ file spreadsheet.ods 
spreadsheet.ods: OpenDocument Spreadsheet
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