What caught my attention here is that a few hundred machines were still down at this Bank following correction of the problem.

CIBC officials say that most of the 1,200 cash machines knocked offline yesterday are working again. But a few hundred machines, mostly in eastern Ontario and located in convenience stores are still out of order. The outage occurred during a routine upgrade of a software program, bank spokesperson Rob McLeod said.

Source: TheStar.com – CIBC ATM’s back online

I understand from sources, that the few hundred still down have to be individually visited to have a software change made at each individual location.  This highlights the need to have all machines networked over TCP/IP with central software management, which CIBC doesn’t have for these locations.  That means each ATM must be visited individually to correct their problem, causing costs, and delays.