The title seems simple enough and it is, if the right syntax is used. Removing a CAS array can be performed using the Remove-ClientAccessArray cmdlet. Anyone would think that the identity parameter that follows the remove command will be the name of the CAS array. But no, the identity parameter is looking for the FQDN of the CAS array.
Surprisingly, the TechNet documentation is wrong as well.
I have a CAS array named “HEW CAS Array” with an fqdn outlook.exchangemaster.me.
Running Remove-ClientAccessArray –identity “HEW CAS Array” (as mentioned in TechNet) gives the error shown below.
The correct syntax is Remove-ClientAccessArray –identity “fqdn of cas array”. The identity parameter is optional though.
Hopefully Microsoft will update the article soon 
