Just to clarify.. Yes, vertipaq is the tech behind power pivot, power bi and sql server analysis services (in tabular mode) and the same column-oriented storage is also used in sql server. Excel generates queries against the data stored in a vertipaq model. You cannot write normal excel formulas on top of it and you have to use DAX (a unique to msft language, which is the replacement for MDX) instead, which is pretty much a no-go for anyone but well-trained power users.