The Community edition is basically the Professional edition with licensing restrictions. Meaning extensions are fully supported. From the [official page](https://www.visualstudio.com/en-us/products/visual-studio-co...)

Q: Who can use Visual Studio Community?

A: Here’s how individual developers can use Visual Studio Community: Any individual developer can use Visual Studio Community to create their own free or paid apps. Here’s how Visual Studio Community can be used in organizations: An unlimited number of users within an organization can use Visual Studio Community for the following scenarios: in a classroom learning environment, for academic research, or for contributing to open source projects. For all other usage scenarios: In non-enterprise organizations, up to 5 users can use Visual Studio Community. In enterprise organizations (meaning those with >250 PCs or > $1 Million US Dollars in annual revenue), no use is permitted beyond the open source, academic research, and classroom learning environment scenarios described above.

From another [article](http://blogs.msdn.com/b/dorischen/archive/2014/11/12/q-amp-a...)

Q: What are the specific features of the Visual Studio Community 2013?

A: Visual Studio Community 2013 shares the same features as Visual Studio Professional 2013 today and licensing terms determine who can use this product. Based on the target audience for this product, SharePoint, Office, LightSwitch and Cloud Business Applications are not included in the installation.

Edit: formatting, can't figure out how to quote the text.