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Navigating through the backend of your site is easy, once you get used to the quirks of working within Joomla. Joomla version 2.5 (above) and 3.x (below) have very different default user interfaces, though much of the same basic principles apply to each.
Joomla Documentation /docs/joomla/platform/administrator.mdHall is free for the first 1-5 users. If your team has more than five users, the fee starts at $3 per person each month. Group video conferencing is available in the Enterprise plan, with upgrades possible in the standard Business plan.
RocketTheme Articles /blog/team/109-group-chat-solutions-for-teams