I found an interested article in Merit Solutions blog about the announce of Microsoft discount for current Sage users!!
The promotion is comprised of an up to 50% discount on Advanced Management (AM) or Business Essential (BE) users. In addition your customers can receive a service rebate of up to a 25% discount of the Suggested List Price (SLP) to apply towards implementation costs and/or services, with a maximum amount of $25,000 USD. This offer applies to new customers migrating from Sage MAS90/200 to Microsoft Dynamics.