I earn my living using Microsoft products & technologies so I will just tell it as it is.
Windows 10 started off badly. It was a clearly unfinished OS full of problems. That was 3 years ago & Windows 10 is now a fine OS. I am running the very latest release (1809) on my Surface & work machines, never had a single problem. I've even ditched buying AV software on my personal devices as the built-in Windows Defender & firewall does a solid job (don't listen to the reviews, they mark it down on purpose as most AV software reviews are paid for). BitLocker encrypted my drive by default which was nice as I thought it was only reserved for Pro & Enterprise versions of Windows 10, so it's good to have that extra layer of security.
Edge is still a steaming turd and I don't touch it. OneDrive integration is seamless & files on-demand (coming soon to Mac) is how a cloud service should be, i.e. exceptional.
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What? Can't get your email to work? Sounds like an issue with your provider. I've never heard of Siteground but their website is a car crash.
https://www.siteground.com/tutorials/email/
Should be straight forward, but I'd contact them for help if I were you.