The best replacement for ie6 is ie8.

The best alternatives to ie6 are rated as following:
★★★★★  ie8
★★★  ie7
  ie 60
  ie4
  ie5
  cx6
  ie 7

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Speaking about ie6, one probably shouldn't forget about ie7.

Other search terms related to ie6 and their ratings are:
★★★★★ ie7
★★★ ie8
★★★ sharepoint 2010
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Google Trends

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ie6
ie8
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