Tiscali webmail is still up and running. What error message do you see when signing in to TalkTalk Mail here.
When you say you did access the mailbox earlier in the year was that very early in the year and not since then. The reason for asking is that if a mailbox isn't accessed at least once every 180 days it is flagged for deletion. I'm just hoping that the mailbox hasn't been completely deleted.
Hi Snapper11, if you add the tiscali mail address in question to the private notes section of your profile I'll take a look to see if it still exists on the database for you.