Exchange 2010 Remove Autodiscover service connection point

I noticed in our autodiscover service there was a left over of an old forest who we use to have a forest trust with for a setup involving linked mailboxes where the accounts existed in one forest and the mailboxes in ours.  I'm trying to figure out how to delete reference to the old forest.  I'm pretty sure I need to run autodiscoverconfig with the -deleteconfig option I'm just not sure the exact sysntax.  Any help or suggestions would be very much appreciated.  We no longer have any visibility or access to the remote forest.  Below is the reference I'm trying to follow.

https://technet.microsoft.com/en-us/library/aa998832(v=exchg.150).aspx

Could I just delete reference in ADSI edit below Microsoft Exchange Autodiscover for the container for the remote forest?
georgedschneiderAsked:
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Simon Butler (Sembee)ConsultantCommented:
ADSIEDIT is what I normally end up doing. Therefore if you can clearly see which one it is, then remove it from there.

Simon.

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