In the past, when Yahoo! made an e-mail account inactive, they didn't delete anything. Recently, I logged into my account (granted, I am mostly using gmail now) after 4 months and 1 week and found that all my mails were deleted without a possibility of getting them backed up.
All I can say is this is really a terrible business decision by Yahoo!. On principle now, I will never spend any money there. If they had given me some kind of warning that their policy had changed, then I would have backed up my information and would not be so outraged by what happened.
So Lycos does it have 30 days and this is pretty terrible, it reflects a trend. Everyone's losing to Google.
I think that this is a reminder that Yahoo! and Lycos and many other companies are on the decline. It's really too bad. Once upon a time, these were amazing companies.