Is this a scam email from Cox/Spectrum—or an incredibly poorly designed migration?

I received the email below, and I'm trying to determine whether it is legitimate or a scam.

The sender is frankbif@optonline.net, and the display name is “cox-is-now-spectrum,” which I understand is now how the company identifies itself. So the display name itself isn't necessarily suspicious.

What is making me question this email is the actual sender address and the instructions:

Final Step
One last step to complete your transition

Hello,

Your email account has been moved to the Spectrum platform.

To complete the migration and keep access to your inbox, one last step is required.

Please use the button below to finish the process on your Windows computer.

Once completed, your account will return to normal.

Complete Migration

Thank you,
Spectrum Team

The sender being frankbif@optonline.net seems extremely odd to me. Is there some legitimate reason Spectrum would send an account-migration email from an individual-looking Optonline address?

And then there's the Windows-only requirement.

If this is legitimate, why on earth would an email migration in 2026 require a Windows computer?

What about the enormous number of customers who use Macs? Or people who don't have a computer at all and use only an iPhone, iPad, Android phone, or tablet?

If the migration genuinely requires a Windows PC, that seems like an absolutely bizarre design decision. If it doesn't actually require Windows, then the wording in this email is even more confusing.

I've also tried to verify this directly with the company, but there doesn't seem to be a straightforward way to email Cox/Spectrum and ask a human a simple question. The chatbot is essentially useless when the question doesn't fit one of its predefined options.

I haven't called customer service because I'm at work and in meetings, so sitting on hold or trying to navigate a phone support system isn't really an option during my workday. I'm simply trying to determine whether this email is legitimate without having to spend a significant amount of time on the phone.

So I'm hoping someone here can tell me:

Is this a legitimate Cox/Spectrum migration email, or does it look like phishing?

Has anyone else received this exact email, particularly from frankbif@optonline.net? If you've verified it with Spectrum/Cox, I'd really like to know how you confirmed it.

And if this is legitimate, I'd also love to know why completing an email migration apparently requires a Windows computer.

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