I worked with MSSQLServer 05/08/12 in some projects and the whole suite for the time being was one of the best related in terms of easiness to deploy plus due to the integrations with Integration/Analysis services you could deploy cubes and serving that directly on Excel and if you had some people creative in VBA you could reach a very sophisticated and effective way to provide reports.
I am huge fan of PostgreSQL, but back in 2005/2012 in all organisations that I worked would be very hard to justify 3+ extra FTE because someone was idealistically about Open Source a land costs.