What was happening in payroll in 2012.
In 2012, the Canadian HR and payroll software market was overwhelmingly on-premise. Customers ran payroll on installed software, on internal servers, with internal IT teams. Cloud payroll was a contested category. The conventional concern was data co-mingling: if Vendor X runs many clients on the same database, what stops Client A from seeing Client B's payroll? Multi-tenancy answers that question architecturally instead of contractually.
Linda's 2009 commitment, on the record in 2012, was specifically about isolation under shared infrastructure. The full sentence she gave Zachary Pedersen was: "In 2009, we said this is where we are going to head and it's going to be multi-tenanted. So no client would ever fear the risk of access by another client." That is a precise architectural claim, made by the President of a Canadian payroll software company, in a Thomson Reuters trade publication, with a fact-checking editor in the loop.
The same architectural decision is what shipped through the Curos Technology Platform rebuild around 2010 (co-architected by Linda and Andy Woolley), and is what the Workzoom platform runs on today. Every Workzoom customer, from the County of Renfrew in Ontario to Cable Bahamas in the Caribbean, sits inside the same multi-tenant cloud architecture Linda described in 2012.