I have 4 IMAP accounts setup within Seamonkey. I noticed the
subscriptions for the 3 IMAP accounts connecting to local servers are
not subscribed to "INBOX"; however, my Gmail account is subscribed to
"INBOX".

I have not been able to discern the subscription to INBOX from the
lack of. My Inbox seems to operate normally regardless of
subscription.

What are the technical consequences of un/subscribing to INBOX?