The best replacement for 2003 is 2004 dom perignon.

The best alternatives to 2003 are rated as following:
★★★★★  2004 dom perignon
★★★★  2008
★★★★  2008 server
★★★  office xp
★★★  office 2007
★★★  2007
★★  word 2007
★★  2003 r2
★★  xp
★★  excel 2007
★★  2007 office
★★  office 2010
★★  1979
★★  2002
★  2008 hulk
★  1996 nba draft
★  exchange 2010
★  word 2010
★  windows xp
★  r2
★  2007 converter
★  access 2010
★  windows 2000
★  windows server 2008
★  access 2007
  outlook 2007
  2005
  office 2013
  2000
  server 2008
  exchange 2007
  hulk 2008
  mcitp
  excel 2010
  5.0
  microsoft word 2007
  mcitp 2008
  windows mobile 5.0
  visual studio 2005
  windows mobile 2003

Your alternative for 2003 is not listed? Suggest!
Speaking about 2003, one probably shouldn't forget about office 365.

Other search terms related to 2003 and their ratings are:
★★★★★ office 365
★★★★ gmail
★★★★ exchange 2010 issues
★★★★ active directory
★★★★ exchange 2010
★★★ exchange server
★★★ smtp connector
★★ exchange 2013
★★ yahoo mail
★★ hotmail
★★ office 2010
★★ mac mail
★★ business contact manager
★ outlook 2013
★ office 2013
★ domain controller
★ outlook 2011
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You have in mind a companion for 2003 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 2003 in all years. Click on graph for more.
2003
2004 dom perignon
2008