Collaboration takes time and resources. So if you want people to work together, you have to make it as easy as possible.
For example, you can use simple, off-the-shelf tools like Dropbox and Skype to help people share and communicate. (Be sure that any programs you use work seamlessly with your IT system.)
If some of your employees aren’t confident with the technology, pair them with someone who is. People are much more likely to adopt a new technology if they have someone they can turn to for help, rather than learning it on their own or relying on an IT hotline.
And for major collaboration projects, consider assigning co-leaders who can shoulder the administrative burdens.