MMC is testing its marketing skills it seems
Horizontal diversification
The company adds new products or services that are often technologically or commercially unrelated to current products but that may appeal to current customers. This strategy tends to increase the firm's dependence on certain market segments. For example, a company that was making notebooks earlier may also enter the pen market with its new product.
When Horizontal diversification is desirable?
Horizontal diversification is desirable if the present customers are loyal to the current products and if the new products have a good quality and are well promoted and priced. Moreover, the new products are marketed to the same economic environment as the existing products, which may lead to rigidity and instability.
Another interpretation
Horizontal integration occurs when a firm enters a new business (either related or unrelated) at the same stage of production as its current operations. For example, Avon's move to market jewelry through its door-to-door sales force involved marketing new products through existing channels of distribution. An alternative form of that Avon has also undertaken is selling its products by mail order (e.g., clothing, plastic products) and through retail stores (e.g.,Tiffany's). In both cases, Avon is still at the retail stage of the production process.
You know it makes sense! 
