STARTTLS certificate about to expire, do I need to renew in my scenario?

Hello All,

My Exchange certificate will soon expire.

We are currently running a Hybrid configuration between Exchange 2007 (On-Premises) and Office 365. Most of our users have been already migrated. Our Outlook email clients are pointing into the Office 365 servers but our MX record is still pointing to our on premises Exchange 2007 box (MX record will be change to point into the Office 365 servers in the next few weeks).

Since, I will say, all my SMTP traffic is handled by the Office 365 servers, do I need to renew the certificate on my on-premises Exchange 2007 server?

If yes why?
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Vasil Michev (MVP)Commented:
You will need one, because the connector from on-prem to the cloud uses forced TLS by default. You can change the connector settings or change the MX altogether.

Another option is to get a free replacement certificate from

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Vijaya Babu SekarAssociate Ops ManagerCommented:
Yes, you need to renew the self signed certificate in hub server. because starttls is use for internal and external mail flow also that means you can assign the certificate to SMTP. and you may get the 12014 event id. so could you please follow the below article.

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