Your Yahoo! account has been inactive for an extended period of time and is being recycled. If you need a new account, please sign up for a new one. ..... ummm whaaaaaattttttt
It's just strange, because since your email and Flickr are tied together, even if you didn't use your Yahoo account for mail, you would think that logging into Flickr with it would keep it active.
I found this...maybe give it a try? Try logging in from yahoo.com instead of Flickr...it might give you the option to reactivate if it's not too late. help.yahoo.com/kb/index?...