M&S: ""Sales Ops manually inactivates the customer's Business Alerts product in iBase. The M&S for Sage Alerts & Workflow M&S will be co-termed with the ERP system, so when a renewal invoice is created, it will include Sage Alerts & Workflow instead of Alerts from Global Software."" Based on that (from an e-mail I received), they are considering the maintenance already paid for Business Alerts
I was also told that if a client reinstated maintenance, this trade-in would apply, but I doubt that reinstated maintenance would include Business Alerts, so the standard $399 on KnowledgeSync would most likely apply.
Oh, and I asked, of course, and there is no tier credit applicable on this trade.