---
tags:
- "⭐topic/\U0001F4BEsoftware/exchange"
- "⭐topic/\U0001F4BEsoftware/windows/server"
- "⭐topic/\U0001F4BEsoftware/m365"
- "\U0001F6A9purpose/ℹ️documentation"
---
# Updating Exchange certificates   
   
## Federation Trusts   
Federation makes free/busy times and on-prem calendar/contact sharing available through Exchange Online. **Process to renew is different if the cert has already expired.**   
[https://learn.microsoft.com/en-us/exchange/renew-the-federation-certificate-exchange-2013-help](https://learn.microsoft.com/en-us/exchange/renew-the-federation-certificate-exchange-2013-help)   
[https://social.technet.microsoft.com/Forums/en-US/c863b6c9-9456-47f2-a1e1-db1787acc83f/unable-to-publish-next-federation-certificate](https://social.technet.microsoft.com/Forums/en-US/c863b6c9-9456-47f2-a1e1-db1787acc83f/unable-to-publish-next-federation-certificate)   
   
## Send/Receive Connectors   
`TlsCertificateName` must be formatted like `<I>issuer DN<S>subject name`, e.g.:   
```powershell
$cert = Get-ExchangeCertificate -Thumbprint ABC123
$cert = "<I>$($cert.Issuer)<S>$($cert.Subject)"
Set-SendConnector "Outbound to Contoso" -TlsCertificateName $cert
Set-ReceiveConnector "Default Frontend Exchange" -TlsCertificateName $cert
```
   
[https://www.azure365pro.com/replacing-send-connector-certificate/](https://www.azure365pro.com/replacing-send-connector-certificate/)