Questions about Jahia

Dear all,
 
I am interested into Jahia product and I have two questions about the product:
 
-> I would like to use Jahia to post on a website some PDF or Word files. Some Jahia customers comments (I have comments on website) said Jahia is not suitable to manage large file (several megas). 
Can you explain to me why Jahia is not suitable in this case ?
 
-> I would like to use a a shared calendar among users. It is said (from the website www.cmsmatrix.org) that there is an event calendar. But when I look for the documentation or contribution, there is no shared calendar. I have found a customer that use a shared calendar in PHP. 
Do you know if a shared calendar exists or if a shared calendar will be developped ?
 
Thank you very much for your help.
 
Jérôme CORNET.