---
tags:
  - 🏷️topic/💾software/windows/server
  - 🏷️topic/💾software/m365
  - 🚩purpose/ℹ️documentation
  - 🏷️topic/💾software/exchange
---
## 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://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/