Windows Live Messenger 8.5 (2008)
You could use a portable version of Windows Live Messenger on a stick.
You could download it from here.
This is not a official release from Microsoft so use it on you own risk.
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YPOPs! – free POP and SMTP acces to you yahoo email account
YPOPs! is a free open source software that provides POP3 and SMTP access to Yahoo! Mail. You can use your favourite email client, be it Outlook, Thunderbird, or whatever else you like and connect to Yahoo! Mail seamlessly.
YPOPs! is an application that provides POP3 and SMTP access to Yahoo! Mail.
How do we do [...]