Customer of company X takes e-mails sent to her and changes content to get what she wants. Is that illegal?

Question

A customer my co-worker was dealing with over a long course of time, mostly over e-mail, just got penalized financially for not taking care of a customer's needs. The customer says she tried and tried to get certain features added on to her account and e-mailed these e-mail conversations as "proof" to my co-worker's manager.

The problem is, is that the original e-mails sent to her from my co-worker were modified to change what my co-worker stated as well as the reply for personal gain, and was sent as "proof" to the manager. Unfortunately for the customer, the original unmodified e-mails were kept untouched on the server.

Case in Point:

(X is Company; C is Customer)

Original E-Mail:

C: I want Feature A on Acct A
X: Feature B is better
C: No, feature A plz

Modified:

C: I want Feat B on Acct A
X: OK, Sure!
C: OK, Great! Thanks!

I kid you not, it was that blatent.

So, my question to all of you, is this illegal - and if so, what crime does it fall under?

Answer 1

If the emails constitute a contract for the purchase of goods (software), then I can think of at least fraud and forgery of a legal document.

Answer 2

It is indeed illegal, and would be fraud.