The best replacement for windows server 2008 r2 is 2008.

The best alternatives to windows server 2008 r2 are rated as following:
★★★★★  2008
★★  windows home server
★★  windows server 2008

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Speaking about windows server 2008 r2, one probably shouldn't forget about hyper v.

Other search terms related to windows server 2008 r2 and their ratings are:
★★★★★ hyper v
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windows server 2008 r2
2008
windows home server