Is this Intellectual Property admissable in court?

I own a small manufacturing business and I have a co-owner that has pertinent information to a criminal case through emails and some pictures. That computer is used by that person but it is owned by the company and therefore me also. The emails are generated on a company email address. Do I not have the right to use these emails and pictures in the criminal case? Although they are of a peresonal nature, they can be accessed by me on my computer which is the server for both computers. Are they not intellectual property owned by both owners and are they not admissable in a criminal case. If so how do they have to be transferred? Copy and paste into a word document, forward to another location, or somehow put on a flash drive or something of that nature in order to be valid evidence.