It's not sure that Windows 10 will run flawlessly on such an old machine. Do you find Windows 10 drivers on dell.com? If not, it's an interesting experiment.
Losing Office files (losing any files) is only an issue if you don't have a backup of them. But since you can't afford to lose them, I'm sure you have a perfect backup system, so that part of your requirements isn't relevant.
Since MS Office doesn't run on Linux, I'm afraid your new laptop will be a Windows 10 one. But - apart from sometimes lengthy updates - that's not a problem for the large majority of users.
I have dilemma. My Dell XPS 420 is 12 years old, and the hardware works great! But the OS is Microsoft Vista (yes, really). I know the I really need to get a newer OS, but continue to hear a lot of hate for Windows 10.
This computer actually got me thru college, and also we started a business (lakefront lots for sale) and it has all of those files as well. Sine they all are in Office, I really cannot afford to lose them.
So what should I do? Has Microsoft *finally* got the bugs and glitches and demanding updates our of 10, or do I get something else?
Thanx In Advance,