[MikeyB]

How can a company as big as NTL take a customer system offline for a week?
The part that is the most worrying is "During this upgrade our Internet support centres will have limited access to their computer systems."

If anyone where I work suggested that, they would be laughed at.
We are going thru a lot of big major upgrades & system transfers at the moment, and if there has to be any downtime at all, it's done late at night, and in the quickest time possible.

Over 3 weekends last month, we did a complete LAN upgrade, which involved changing settings on every users PC. This was stepped, and planned so as to not affect OUR users, let alone our customers.

Anything more than an hour during normal office hours is totally unaccetable for us