The best replacement for sogo is zimbra.

The best alternatives to sogo are rated as following:
★★★★★  zimbra
★★★★  kolab
★★★  citadel
★★★  victoria court
★★★  zarafa
★★  zecco
★★  zentyal
★★  eurotel
★★  egroupware
★★  openchange
★  roundcube
  matahari
  tradeking

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Google Trends

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sogo
zimbra
kolab