upgrade mailbox

Is this a valid email that I need to take action on.  Sender is [Edit: Invalid address].  Uncertain if this is a scam or valid action that needs to be taken.  Here is the email

We are shutting down the old version of your email account on  16th August, and you will no longer have access unless you upgrade to the latest version.
Upgrade Here      Update your Mailbox now to avoid service disruption and to continue enjoying uninterrupted access to your email.

Please do not reply to this message.  Mails that are sent to this address cannot be answered.

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THIS IS A SERVICES RELATED EMAILCom:cast will occasionally send you service-related emails to inform you of service upgrades or new benefits.
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Comcast Cable, One Comcast Center
1703 JFK Boulevard, Philadelphia, PA19105.