Using putty or another ssh client to connect to Server

First you have to setup an SSH Server on the SBS2011.  This article is about one: http://www.techrepublic.com/blog/tr-dojo/set-up-a-free-ssh-server-on-windows-7-with-freesshd/

How secure is freesshd?

Well, according to this, there is an exploit for freesshd version 1.2.6 which is the same version as the one available from http://www.freesshd.com/?ctt=download

Then i cannot use freesshd.  I need to use another secure method.

Possible options:

Bitvise SSH server - http://www.bitvise.com/ssh-server-download
OpenSSH - http://openssh.org/

Thank you.  This is for the Server side?
If yes, are they secure?

A server is for the server side yes. I checked Bitvise at Secunia, no current vulnerabilities for version 6.03. For OpenSSH, I found one.

Thanks again. Any other suggestion for the client side then?

PuTTY - http://www.chiark.greenend.org.uk/~sgtatham/putty/

Thanks. Can anyone suggest free software which will work on the SBS 2011?

Well, OpenSSH is free, Bitvise is not but quite cheap ($100 per server).

Thanks. Any free software which can be installed on SBS 2011?

>> Any free software which can be installed on SBS 2011?
What do you mean? Your question was how to connect using SSH to your SBS 2011 server, that question is answered, right?

Do you need additional software or is your question still about SSH related software?

Steps needed so that a Linux client can use putty or ssh to connect securely to SBS2011.
Steps need to include the setup on SBS2011 so as to be able to securely and safely connect from a Linux computer.
This includes Steps which would possibly include free software.

Unsure if this works, I need to ask a question.