If you still have webmail access then you need to download your contacts TODAY (if you have't already), as when the account closes you are likely to lose access.
Webmail access is closed down often before the 90 day deadline with access to your mails still being allowed using email clients such as Thunderbird. However even with the 90 day deadline you should get any emails you wish to keep downloaded from the server ASAP as the time goes by quickly if you aren't careful.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.