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I'm using Thunderbird

Whenever I click a link in an email, it doesn't open a new window, it loads the page in an existing browser window.

Is there a way to make Thunderbird open links in a new window?

If you are using FireFox as your default browser:

If another program wants to display a web page in the default browser, Firefox will reuse an existing window by default, which means that it will navigate from a page you might be reading. To stop this, Go to Tools > Options... (Edit > Preferences... under Linux and Mac OS X), select Advanced and click on Tabbed Browsing. Under "Open links from other applications in:", you can choose the alternative you prefer.

Is it possible to do with IE?

i have no idea - sorry

funny mine started doing this the other day, have no ideal what I have done 2 fuck it up.