Hello: We're looking of a content management system (CMS) that supports at least 10000+ users. We need for there to be a Forms Builder. We need for there to be dynamic reporting (PDF,XLS,XML, and HTML). We need for there to be news feeds (RSS and Atoms). Additional functionality might also be required. Please help steer us in the right direction. Thinking of going with Interwoven TeamSite, for example. Thank you. Naum P.S. "You're great!"
You can do that with wordpress in short order with a plugin or two. You would otherwise probably want to go with Drupal.
Drupal is the obvious choice, it has the functionality you want and can handle large amounts of data I have Drupal sites with millions of user accounts and content nodes
Most CMS platforms can in theory do what you require, but each have their pros and cons. As Nigel says, WordPress can certainly handle it with a few plugins - it sometimes has a reputation of being more suitable for beginners, but it's powerful in the right hands, so there's no reason why you couldn't make it work. That said, considering you're posting this on the Joomla section of the forum, Joomla would be a great choice for you because it offers more comprehensive in-built functionality than WordPress, so you don't have to install loads of extensions. Drupal's also great - very flexible modular layout. It's quite a broad topic, very difficult to narrow down to the 'best' choice!