My employer (large Fortune 500) recently "soft banned" Confluence and Jira, meaning groups already utilizing it can stay on it until our enterprise license runs out at the end of the yearly support contract. At first I thought it was really stupid decision as Confluence, at least, is fantastic product and Sharepoint/Notes (the enterprise replacement solution) is a horrid alternative. One of the admins said there were licensing issues that drove the decision. I figured someone was just being cheap but I bet this was the reason.