Many users have experienced the following dependencies errors (or some kind of them) while trying to install/update SOGo or simply trying to update SME with yum update:
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memcached-1.4.2-1.el5.i386 from sogo has depsolving problems
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--> Missing Dependency: libevent-1.1a.so.1 is needed by package memcached-1.4.2-1.el5.i386 (sogo)
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Error: Missing Dependency: libevent-1.1a.so.1 is needed by package memcached-1.4.2-1.el5.i386 (sogo)
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To solve this issue you need to install memcached form Epel; the repository can be activated according to wiki http://wiki.contribs.org/Epel .
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Once configured the repository you can install memcached (The current release available is memcached-1.4.5-1.el5.i386.rpm - may 2012):
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yum --enablerepo=epel install memcached
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Now you will be able to install/update SOGo and run yum update fine too.