vacation yahoo email

How can I download to my email program messages I’ve already read in Yahoo mail?
My normal mode is to have all email for me sent to my Yahoo address. I have Yahoo forward it to my internet service provider and I download it to my PC using Thunderbird. When on vacation, I disable the downloading and read the messages directly on Yahoo. When I get back, I’d like to download from Yahoo to Thunderbird the messages I’ve saved, responses I’ve sent, etc. so I have everything on my PC. I can’t figure out how to do this except one message at a time. Is there a better way?
Here’s a link to a Yahoo! Mail Errors and Problems Reporting and Help Request Form.
http://help.yahoo.com/l/us/yahoo/mail/yahoomail/bug_f.html?from_url=http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q=yahoo+mail+help+form
Here’s a link to a Yahoo E-Mail Help Request Form:
http://help.yahoo.com/l/us/yahoo/mail/yahoomail/general_f.html?from_url=http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q=yahoo+mail+help+form
Use this form to report incidents of abuse or harassment.http://help.yahoo.com/l/us/yahoo/mail/yahoomail/forms_index.html
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