[Owncloud] internal messages

[Hello Dear]

Dear All, 

I have installed oc 4.5.8 through an Auto Installer Softaculous on my VPS Server and everything is working perfectly. 

I want to install 3rd party app i.e Internal Messages. (http://apps.owncloud.com/content/show.php/Internal+Messages?content=154784)

Is there anyone who has installed this app before and found it stable ? 

Is there any better option of internal messages than this , please advise. 

Regards

OC Learner 
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