Office Imported wiki content seems to be enlarged compared to original office content

There are several reasons for this behaviour:

• Stripping of style tags: <style> tags are discarded when importing documents
• <colgroup> elements are discarded by rendering:

  .#-----------------------------------------------------
  .input|xhtml/1.0
  .#-----------------------------------------------------
  <table><colgroup><col width="87" /><col width="152" /><col width="50" /></colgroup><tbody><tr><td/><td/><td/></tr></tbody></table>
  .#-----------------------------------------------------
  .expect|event/1.0
  .#-----------------------------------------------------
  beginDocument
  beginTable
  beginTableRow
  beginTableCell
  endTableCell
  beginTableCell
  endTableCell
  beginTableCell
  endTableCell
  endTableRow
  endTable
  endDocument
  .#-----------------------------------------------------
  .expect|xwiki/2.0
  .#-----------------------------------------------------
  |||
  

• Placement of images: In spreadsheets, images usually float on the document. But when oo server is generating html, it places those images inside table cells and this causes some alignment and sizing issues.