Does SharePoint 2013 support Co-Authoring?

Yes. You can use the co-authoring function in SharePoint Server 2013 or SharePoint Online to enable multiple users to work on a document without interfering with each other's changes.

Co-authoring eliminates barriers to server-based document collaboration and helps organisations reduce the overheads associated with traditional document sharing through attachments. This capability requires no additional server setup and is the default for documents stored in SharePoint 2013 and SharePoint Online. 

SharePoint Blogs

In 2009 I went to Microsoft’s developer conference, TechEd. This was the same year that the first iPhone was released, and the mobility movement was...
If you’re a regular SharePoint user, you’ve probably wondered if your workplace could do more to organise and manage documents in the right way. Is...
By now you’ll understand the value of investing in a digital workplace. We all want to make work easier and more effective: improve productivity,...