A rule of IT systems is that turning something on again is where the danger lies.
Bringing something up again, «a cold restart», exposes you to all the assumptions that have been made about the environment since the last time you brought it up from scratch.
The longer it’s been, the riskier it is.
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When you make changes in a complex system you will consciously and subconsciously make assumptions about what is already there. What you can rely on.
A lot of you saw that with the Outlook outage. How many of your processes broke when mail and calendars were unavailable?