Oh… and how to find email addresses? If the email address is simple, like the ones above, it’s not that hard to write a GREP for the GREP tab of the Find/Change dialog box, like:
[\u\d.]+@[\u\d.]+

But if the emails are wide and varied, then there are more complicated solutions, such as:

GREP of the Month: Email Addresses

more here:

Shortest GREP Pattern to address URLs and e-mail addresses?

Hey Matthew, your timing is impeccable… we’re doing a full-day event called “The InDesign + Long Documents Summit” on April 5, and a lot of it will cover the stuff you’re trying to do. I highly recommend it:

The InDesign + Long Documents Summit

This is not normal, when importing Excel docs. You might check your settings in Import Options (which you can enable in the Place dialog box).
I’m guessing perhaps the white space character is not a simple space, but instead some kind of special character that Excel or the client is using. If you choose Type > Show Hidden Characters (in InDesign), do you see some kind of special character in there, along with the Ê? If so, see this article:

Free Guide to InDesign Special Characters

Interesting… I haven’t seen that… but it might be because I never quit InDesign! :-)
Are you on Mac or Windows?

Whoa. That is very, very weird. I agree that the IDML route might work. But even before that, I’d suggest choosing View > CPU Preview (or View > GPU Preview, depending on which is selected). Sometimes switching that clears up display oddities.