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Reported by SKaero on 22 May 2012 05:09 UTC as Trac ticket #1488490
First reported in the forum here: http://www.roundcubeforum.net/index.php/topic,9714.msg39153.html#msg39153 and verified the installer is not working in RC 0.8-rc. When accessed it gives the error: "Warning: Cannot modify header information - headers already sent by (output started at /installer/index.php:103) in /installer/index.php on line 153" and doesn't show the check environment page.