Look at the first bullet point of the timeline. Productivity suite approved, upgrade to Calmail cancelled. Then a week ago, they decided on an interim upgrade because not upgrading in the first place caused problems. So, rather than a planned upgrade, the IT folks were thrown into panic mode because their (probable) proposed timeline for safely doing an upgrade, including burning in and testing of new hardware, was cut to a fraction of what it should've been.
You can argue about the budgets, or the IT folks, but this is a failure of management. If (in Spring 2011) they cancelled the upgrade, and then had to have an emergency upgrade, what you have is management that fundamentally does not understand the system. This would (probably) not be the IT folks managing the system, but rather the budget and personnel management that doesn't quite grok how upgrades should be done in a safe and controlled manner. They misjudged the initial cancellation, and then (likely) pushed through a poorly planned emergency upgrade.
If the slides are correct, there is very little having to do with a failure from a technical aspect, and everything to do with a breakdown of management.