I am afraid you are all expecting Virginmedia to be responsible for restoring your lost emails. The terms and conditions for VM email use are clearly laid down in their terms and conditions and it is NOT their responsibility to back up your email, it is yourselves the customers. Its all very well if they do manage ultimately to restore your lost emails, but their Ts and Cs clearly state it is your (the customer) responsibility to backup your mail. See this cute copy pasted from their 2022 latest Tc and C's
"Email use
6.4. You may or may not be offered the opportunity to sign up to a Virgin Media email account. Virgin Media email accounts are subject to availability and Virgin Media does not promise that a Virgin Media email account will be provided to you, nor does it guarantee that additional email addresses to your primary Virgin Media mailbox (if you have one) will be made available. If you use a Virgin Media email account, it is a variable service by nature and we may upgrade, update, replace or withdraw it from time to time. It is your responsibility to back up the contents of your Virgin Media email account."
As you can see from the bold text (it was I who emboldened it), The onus is not on VM to backup your data - it is YOU. GDPR rehires that they have to safeguard what they have against it being stolen or leaked to external nefarious locations, but as long as that hasn't happened, they are NOT obliged to restore all your missing folders or messages. Out of they good efforts we may eventually see the return of some or all of the missing stuff, but if it doesn't happen, its still technically not their problem.
I understand you are all utterly devastated by the loss of this material and the slipshod and/or lack of updates that VM have been giving us, but at the end of the day for those of us who didn't read the small print, is that VMs fault?
I say we should quietly stop moaning and "wait and see". Those who don't leave VM should take the events as a salutary warning that not taking backups of your own data is a gamble which in this case may have gone badly. So . . . learn the lesson and from now on please start taking precautions to safeguard your data in future. That doesn't mean to jump ship to another free provider and continue not taking backups! Whoever you switch to can just as easily have a hardware failure and potentially lose some of your data.