I'm not one to compliment Microsoft software products, but Analysis Services and SQL Server, at least when I used them at the time over 10 years ago, seemed like darn fine products (which they purchased from someone else, I believe...)
SQL Server itself came from Sybase originally, with them and MS working on it as partners for a number of years when it was an OS/2 product, so it wasn't a purchase-a-working-product-and-rebrand-it deal. As Windows NT gained ground, MS & Sybase parted ways (amicably IIRC, when the partnership agreements expired MS licensened the source that Sybase owned and bought out exclusive use of the product name in relation to products for Windows – for a time MS's SQL Server still carried Sybase copyright messaging along with MS's own).
SQL Server v7 was a rewrite of significant parts of the internals, so from that point it is probably fair to call it an MS product quite distinct from Sybase's (which itself continued to be separately developed including significant but different improvements/reengineering of the internals), though still showing some signs of its heritage.
I'm not one to compliment Microsoft software products, but Analysis Services and SQL Server, at least when I used them at the time over 10 years ago, seemed like darn fine products (which they purchased from someone else, I believe...)