The title says it all - sort of.
client had Exchange 2016 installed on a 2012 R2 Domain Controller, which was also a file server. (facepalm)
Uninstalled Exchange, but these app pools hung around and are causing tons of errors in the event logs.
Can I just remove them from IIS?
If so, great...but now this has me wondering WHAT ELSE I might need to clean up from this server.
(I also demoted it to a member server, so now it truly is just a file server.....but I discovered that references to the Microsoft/Exchange folder in the Default profile was keeping new users from being able to login to the server waiting for the user profile service to load.)
Thanks!