The best replacement for office 2003 is office xp.

The best alternatives to office 2003 are rated as following:
★★★★★  office xp
★★★★  2007
★★★  xp
★★  office 2007
★★  office 2010
★  microsoft office 2007
★  office 2000
★  2000
  microsoft office xp
  ms office 2007
  ms office xp
  xp pro
  office 2002
  office 2004
  windows office 2007

Your alternative for office 2003 is not listed? Suggest!
Speaking about office 2003, one probably shouldn't forget about windows vista.

Other search terms related to office 2003 and their ratings are:
★★★★★ windows vista
★★★★★ sp3
★★★★ windows 7 64 bit
★★ compatibility pack
★ office 2007
You have in mind a companion for office 2003 and it is not yet here? Propose!



Google Trends

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office 2003
office xp
2007