Re: Exchange
Just as well.
I remember an email going round the UK arm of a multinational I used to work in, circa 2003, stating that our Exchange servers were running out of disk space and we all needed to urgently archive or delete old messages.
We dutifully went through our inboxes deleting our unneeded messages.
Cue a snippy email a few days later saying that we were getting dangerously close to our limits so we urgently needed to delete unwanted mails.
We'd all deleted over half the emails in our inboxes, as we could all see from our quotas, but the management were looking at server reports and were convinced we'd done nothing.
Turns out that having a few thousand employees delete the staff newsletters attached as bloated Word documents to the regular emails from senior management and HR doesn't make the damnedest bit of difference on deduped storage, and all it achieved was wasting several man-years of labour.
...which would all be forgivable if it wasn't a multinational IT services company, who made a lot of money managing Exchange servers for clients.
We could have saved a shedload of cash if they'd just given the advice at the beginning that they gave us the day before email would otherwise have died:
Archive all your individual email over x months old. (Cue everyone panicking about failing to follow procedure on filtering project-related correspondence into project mailboxes.)