I manage a lot of servers and SSH is one of the usual inroads to get things done on many of them. Have you ever been mobile with your PDA and find that you needed to use SSH to connect to a remote system? That's not possible with Windows Mobile, unless you install a tool like PocketPuTTY. To use that you'll need to be running Windows Mobile 2003 or later.
I tried the pocket Putty on my SmartPhone. It runs however it does not make its job because there is no way to switch between tabs, unless using a SmartPhone with touch-screen. Even my phone comes with a keyboard, no key can move the input column to the next tab thus I cannot really do the job. Hope the next version can support regular smartphone.