Wrong, wrong, wrong!
"Some level of disruption was expected throughout such a fundamental transition to a new system,
No.
If you have done your fucking job correctly, their should be no noticeable disruption.
If we can transfer a contact centre, over a year with all it's add ons, handling a 1.5 MILLION calls a month, running 24/7/365 and not drop a single fucking call, then you have no excuse.
What it takes, is a huge amount of prep work, a mountain of installation planning set up and this is the hard bit, testing, testing and more testing. And after testing, checking, checking and even more checking.
These days it seems to be...looks ok. Lets go live and any issues we can sort them as and when we can be bothered.