Dear developers,

Could you please help restore the Roundcube upgrade tutorial? Old link is: http://trac.roundcube.net/wiki/Howto_Upgrade

But i cannot find it in github repo. It's very important to sysadmins who need to upgrade. Thanks.

Zhang Huangbin, founder of iRedMail project: http://www.iredmail.org/ Time zone: GMT+8 (China/Beijing).