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If you have a spare USB stick, you could install Portable Apps http://portableapps.com/ on it and use something like Thunderbird http://portableapps.com/apps/internet/thunderbird_portable to access the IMAP account.
I've only used it with PC's with XP installed but believe it works with most varieties of W*****s. All you do is stick it in a USB socket and the apps automatically fire up. When you remove the USB stick, it doesn't leave anything behind on the host PC.
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Portable Apps works on Windows 7 and XP. Don't know about Vista or 8.
Another option would be to take a Virtual Box Linux VM with you and use that.
My €0.02
Ewan