I'm not sure what you are trying to do so I'll reply as to the general position, but with the information I think you need. No organisation will give you passwords. So forget that as a route.
If you have now left VM all your e-mail accounts with them will be closed after 90 days (usually) and the contents deleted. That is the serious downside to using ISP related e-mail addresses.
If you are still within the 90 days period and you want access your existing passwords should work. If not you can try using the "Forgotten password" link when you log in via WM web mail and try to recover the account. That way you can reset the password, at least for the time being.
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