The ones where the service you depend on is a healthy core business for them, and they're perhaps too large for an acquisition.
Even in that case, you will still find that no company keeps their products or services static over decades. In most cases you probably wouldn't want them to. Imagine how it would feel to be stuck on Windows 95.
Even in that case, you will still find that no company keeps their products or services static over decades. In most cases you probably wouldn't want them to. Imagine how it would feel to be stuck on Windows 95.