This IDC study contains a five-year forecast for software maintenance revenue, including a comparison with total software revenue.
"While SaaS and subscription business models are gaining traction in the software industry, the traditional license/maintenance model is not going away in the foreseeable future," said Amy Konary, research vice president for Software Licensing, Provisioning, and Delivery. "Despite strong renewal rates for software maintenance, customers continue to be vexed by what they view as a large amount of software budget spent on maintenance and are looking for ways to reduce this."
Forecast and Assumptions
Worldwide Software Maintenance Forecast, 2012-2016
Historical Market Values and Exchange Rates