Hi, Nadya.

>In October at my short-term work place I created an account on hotmail and used it for work related mails. I was also using it for MSN messenger. I also created another account on yahoo. Both of these accounts are extra and I don't check e-mails on them often. But I use this account for MSDN forum, for example.
>
>So, today I decided to check my e-mail in Hotmail and found completely different interface and 0 messages. Where did all my messages go? Was it some bug in Hotmail?

This is the new Windows Live Hotmail they have been working on for the last two years or so. I don't really use Hotmail anymore since a long time, so I don't know what happened with your inbox. I don't think they'd wiped all the previous content from their users. Did you check if they moved the old messages to some folder?