I've tryed to setup my Nokia 5800EM for Mail for Exchange with a gmail account, but I can't make it work:mad:. Does anyone have a guide to do this properbly.

Its for Microsoft Exchange mail accounts.
You need to provide the details for Exchange OWA access and should work.

I don't understand any of what you just wrote

In short, it's not for gmail. Only where you connect to a microsoft exchange server.

Most commonly used for workplace email, not peoples own.