Exchange 2016 - Hybrid - Exchange Delegation Federation certificate expired

[Navishkar Sadheo]

Hi All

Hope everyone is keeping well.

The "Exchange Delegation Federation" certificate has expired on my Exchange 2016 server.

Mail flow between Exchange Online and Exchange on-prem still appears to be flowing fine.

Which is the best way to renew this? Will re-running the HCW recreate the certificate? Also will mail between Exchange Online and Exchange on-prem stop working eventually?

Appreciate any advice.

[#2]

@Navishkar Sadheo Good Morning, 

had to do this once and I just followed this MS Doc:
https://docs.microsoft.com/de-de/exchange/renew-the-federation-certificate-exchange-2013-help

HCW can only establish the FederationTrust but not renew the MFG cert. MailFlow won't be affected. This only has impact on the FederationTrust/OrganizationRelationship from onPrem to Exo.