I caught my wife in a lie. She was out with another man and calims that it was the first time. I believe she is now about to leave me for him. The last phone cell bill reflects about 13 hours of conversations to his cell phone. This doesn't even include the his office number which I have yet to determine. I have countless e-mails from them; some talking about kissing when they met and leaving xxx's & ooo's at the end of the message. Could the e-mails coupled with the cell phone record be enogh proof of infidelity. She has admitted that she met him secretly and to kissing him, but she will admit no further.

Hell yeah she is cheating on you. It doesn't matter how good of a "friend" this guy is even her admitting to kissing him counts as infidelity

Even if you can prove it what do you plan on doing with it?
Confronting her could only push her further away faster
If she is cheating she will continue
If she is planning on leaving she will
Knowing the details more than what she has admitted to isn't going to change anything
Except maybe you wanting to divorce her.
Only thing you would accomplish is creating arguments
Unless you want to be the first to leave.

If she hasn't shown any attempts to have a change of heart when she admitted to what she has I doubt she is going to suddenly break down and be the sorry for her cheating and she will never do it again because she wants to work things out.

This is important to know - what is your goal? Gathering intel on her activities is fine, but what then? So you prove it? So she confesses more, so what then?

She is your wife, and your commitment to one another is supposed to be stronger than any issue. Even infidelity. If you've done absolutely nothing to contribute to this situation, then fine. But if you have, are you willing to fix it and forgive her?

You CAN save your marriage, but you have to decide that ahead of time. Once you enter the battle over this issue, your true intent will rule your words and your actions. If you are unforgiving and unaccepting, your confrontation will be the first nail in the coffin instead of the first step toward reconciliation.

So, emails and phone records aside, what is your goal?

Right, what is it you want? To answer your question, yes I think you can prove infidelity. But what do you want to do with that proof?

Since you posted in the Divorce forum, I assume you want to file for divorce. But you may not need to prove infidelity to do so. If you want a divorce, then see a divorce attorney and ask what your next steps should be.

Have you watched the TV series, Cheaters? Cheaters - TV.com
You should consider hiring a private investigator, pronto.