This is why a large software vendor cannot, by default, be deemed a "safer" option than a small vendor. In B2B software, the odds of the vendor going bankrupt are usually dwarfed by the odds of the vendor discontinuing the product. The chances that Microsoft would stop supporting core offering (ex: Excel / Word) within 2 decades are low, very low. However, the same odds cannot be applied to every single product pushed by Microsoft. Yet, when it comes to long-term support, Microsoft is one of the best vendors around (generally speaking).