Remove old Exchange OWA Cert Authority

We keep receiving the following error messages on our Domain Controllers every 8 hours -

"System Error: Source: DistributedCOM

DCOM was unable to communicate with the computer exchange.domain.local using any of the configured protocols."

I ran certutil -dump and see an old OWA CA from our old 2003 Exchange server.

This old Exchange server was decommissioned long ago.  What do we need to do to remove this CA from Active Directory?

C:\Users\Frank>certutil -dump
Entry 0:
  Name:                         `domain'
  Organizational Unit:          `'
  Organization:                 `Organization Name'
  Locality:                     `Main'
  State:                        `AK'
  Country/region:               `US'
  Config:                       `exchange.domain.local\domain'
  Exchange Certificate:         `'
  Signature Certificate:        `'
  Description:                  `OWA'
  Server:                       `exchange.domain.local'
  Authority:                    `domain'
  Sanitized Name:               `domain'
  Short Name:                   `domain'
  Sanitized Short Name:         `domain'
  Flags:                        `1'
  Web Enrollment Servers:       `'

Thanks,