Powershell Script to remove custom contact form

We are using a custom contact form in Outlook, and realized when we moved to Office365, or as we slowly are moving to it, that in Online mode in Outlook, the Contacts section of outlook is slow. Long story short, looking to use Powershell to get rid of this form. If you look in list view, instead of it being IPM.Contact (normal contact form), we have one called IPM.Contacts2008, which is our custom form. I found a link that is kind of close to what I want, but not really understanding how to fully customize my script.

http://matthewyarlett.blogspot.com/2014/01/scsm-changing-message-class-of-emails.html

Is there a better way, and I don’t know exactly where I’d change the Message class. We had found a way to do it with a custom form, but it’s tedious, and requires developer options, etc, and has to be run manually. Also, if you run the script we created while in regular mail view it screws that up, so with our script we have to be in contacts in outlook, then go through it.

Not sure if this is the proper place to ask this. I don’t know how to customize this script in the link to match what I want it to.