"I still use it to chat to my elderly parents, but they get annoyed with it because MS keep 'improving' the UI and they have to work out how to use it all over again after it updated to the latest version."
That's because they lack the essential component. Intuition. Every time MS bring a new version of something out, it's almost always described by them as "More Intuitive", which they love to imply is even easier to use than the last one. I would suggest you subscribe your elderly parents to the MS Intuition Replenishment Program. For the low, low introductory price of £20 per month (first three months only, thereafter £50 per month, minimum contract term 36 months) MS will carefully monitor all their interactions with MS products and make sure their intuition levels are properly maintained. New Intuition Cartridges will be delivered to their door before they even realise their old intuition is about to expire.