Intranet can definitely serve as a very powerful tool to communicate in an organization. But you need to keep in mind a few points which can help you achieve your objective of making it a successful platform for your organization.
There is no doubt in this that Joomla is one of the best content management systems available out there in the market. As many websites have started using Joomla it's become really significant that they are designed and hardened properly to prevent any security issue.