De-indexed by MSN?

[Mosqwik]

Greetings!
Recently I had a few problems with a few sites I just start to handle (all on same IP):
www[dot]pmoz[dot]org
www[dot]pro-board[dot]com
www[dot]jdhealthcare[dot]com
Recently they got de-indexed by MSN, for a reason that remains wierd to me. Even more a few other sites that linked to these ones (located on different IPs) received a penalty (drop in SERPS).
Do you have any idea why this happend - as far as I know the sites are legitim and no black hat seo is used.
Please let me know if you notice anything that may result in this MSN ban / penalty.
Thank you in advance.

[flanok]

One of my sites was de indexed this time lasy year. it took 3 months of hounding to get it back, including a full restructure of the site.

In their eyes my site was spam.

It wasn't,
however the links to the relevant information was hidden in my footer menus and to someone who glanced at my site quickly, could see it as an affiliate site.

I changed my menus, brought the relevant information to the forefront and only by sheer luck, in catching a MSN person online, did I get some feedback and then reinstated.

MSN do reply to your emails, but I wished they had not, because the info within them was worthless and might as well have automatic replies.
I believe a human made the decision to ban my site last year, just as it was a human that re instated it.

This has probably happened to you.

Good luck, you need to decide if the MSN traffic is worth it.

Mark