c1h-excel-15.cdn.office.net is part of Microsoft's Office CDN infrastructure. It's not a website you browse or buy from -- it's a backend server that delivers Excel-related content. That context matters: the missing about page, contact info, and privacy policy aren't red flags; they're expected for a CDN endpoint.
The security setup is solid: a valid certificate from Microsoft, clean threat reports, and hosting on Akamai. The one technical note is that it still accepts older TLS protocols, but that's a minor detail for this type of server. There's no evidence of abuse or blacklisting.
If you hit a 404 page here, that's normal -- the path you tried isn't meant to be accessed directly. This is a legitimate part of Microsoft's cloud, and there's no reason to be concerned about safety or fraud. Is c1h-excel-15.cdn.office.net a scam? No. It's a genuine Microsoft CDN node.