Exactly the same thing happened to us yesterday. Everything on the Plusnet mail page disappeared - all the folders and contents etc, which contains many years of valuable info, including my wife's Apple Notes, which presumably was synced to the Plusnet webmail system.
I immediately contacted Customer Tech Services and talked through the issue with a contact named Will. He accessed our mail screen and confirmed that there was a serious problem. He was unable to ascertain why the deletion had occurred and he confirmed that we had not been given any warnings about any capacity limits, which was clearly because we were nowhere near the limit! He was able to 'refresh' the Plusnet server, and this now allows mail to be sent and received, but all the historical stuff, prior to mid-morning yesterday is still missing.
This like someone coming into your home and setting fire to your filing cabinet!!
Will promised to call me this morning with an update, but did not seem optimistic about the problem being fixed quickly .
Will just called (bless him!) and confirmed that the problem had affected many customers and that they had identified the problem and the network engineers were working on recovery for everybody . Thankfully, he assured me that the no emails had been lost and that in time they would all be restored, but that it may take sometime. Phew! Close call.
