Are these actually unused?
There has been a lot of Gerrymandering with the PCTs and mergers between different departments under the continued remastering of the whole Health Service. Everyone getting their old job as their new job, but working for a different part of the business and getting a new email address to boot. This means that millions of emails have to be received at the new address that were sent to the old address for continuity of support and communication. Why bother using the new fangled address when all your email is available in the old mailbox and your stationary and cards (not to mention the building you work in and the posters on the wall there) still have the old details on?
And what mother-of-satan did the deal with MS that led to the problem with this system being the death-knell for email that is the Outlook 2GB PST bug? Try reading this week's email crop when reams of useless jibber-jabber is archived from over 10 years ago. People stay in the NHS for life (if they like working for them) and some of those consultations and mails could save your arse one of these days, you don't want to delete them. Try asking IT to dump them onto a DVD to take home ... Can't do that, this could be sensitive customer data. I'll keep it at work then? No, I don't have an office, I hotdesk when I need a computer to work at. Give me NHS login over VPN from home so that I don't have to spend an hour looking for a desk to work at? Sorry, we can't do that until our IT contract is signed for the time it would take to install that ability in your area.
NHS IT is wank. There is no other way to say it.
Half the people using this system are people-people and have no clue what the inter-tubes do, the other half are too busy navigating the FUBAR mess just to do their jobs. Who has the time to explain the question "what do you need from IT" before interpreting their answer?
Committees decide who to contract to without taking into account the needs of their staff, based on advice from the bean counters.