Hi,
looks like I didn't notice that SSH seems to be really commercial now. Is this right? Do I need to pay for it if I am still using it?
There are some exceptions however these are not in the actual license as far as I know, they are PR releases on the ssh.com website. I wouldn't completely trust it. In any event future usage is in question (remember, ssh used to be "free", Tatu sure has changed).
Is OpenSSH a full-featured substitute for SSH? Are there major problems in configuration to expect if I try to deinstall SSH and go for OpenSSH?
Yes, actually many (myself included) would say that OpenSSH is better then SSH. OpenSSH for example has incorporated various security fixes in the older protocols that Commercial SSH has not, the reason for this is SSH communications wants to kill off the old protocols to sell more software. Something else to note: OpenSSH has grabbed a huge amount of market share and is growing. I know many many people using OpenSSH. Most SSH related articles I have read (and written =) use OpenSSH as the example and typically only mention commercial ssh as a footnote. I do not actually know of any company/etc using commercial ssh (if you are I'd like to know so I can claim I know at least one =).
Marko
-Kurt