Only just seen this.. and the only input I can give is as follows:-
I am still running some @virgin.net email accounts that I have been using for probably around 25 years or more??. (original set up in the days of dial-up email & inter-web surfing! before they brand name changed to "VirginMedia")
Other family members, (children, I have 5 children, youngest just turned 27 this month), are still using some @virginmedia.com email accounts that were added and set up when they started to increase the number of email accounts you could create.
Several years ago Virgin did contact us to say they would be deleting old @virign.net accounts unless you requested to keep them.. we kept 3x @virgin.net accounts, (1x me, 1x my wife, 1x my business
[email protected])
So we currently have 3x @Virign.net accounts, 6x @Virginmeda.com accounts, and I am not aware of any issues preventing them working as expected??
I do also have my own business website with other work email addresses @"mywebsitename.co.uk" hosted and managed by our old forum colleague canoeboy..
I access my emails (virgin and website) via a combination of bog-standard Microsoft Outlook on work desktop & laptop.. and via the bog-standard Apple email service on i-phone and/or i-pad..
My wife accesses her Virgin email account via i-phone and/or i-pad...
No idea exactly what the children use to access their emails.. probably Apple phones/tablets/laptops etc...??
But as I said.. as far as I know everything is all working hunky-dory!!
Can't remember exactly when, but I do recall there was a data breach of some virgin email accounts a while back and they closed down quite a few accounts for several days before they were brought back on line again..
I have NO idea about Thunderbird??? the only Thunderbirds I know are the puppets who live on Tracey island and do rescues with their various rockets, planes, submarines etc.. etc..
(Gerry & Sylvia Anderson had a major impact on my childhood 5... 4... 3... 2... 1... Thunderbirds are GO!!!)
No idea if any of that helps or not???