Hotmail often is choc a block with a host of junk email. Sometimes it identifies genuine mail as junk which is a pain. The default option is to add a single email id to your safe list so that future messages are deliverd to your inbox.
One interesting option which is not evident immediately is the ability to add to your safe list a complete domain from which you regularly receive emails for instance if your company with domain xyz.com is from where you receive mails from various people. The way out is to add the entire domain to your safe list.