A few years ago this was a regular question - almost weekly - and it became known as "Spy-vs-Spy".
The problem with this spying behavior is that the information takes on an inappropriate value-added because of the means in which it was obtained. Simply put, guys would put too much value on the information since they took such a risk to obtain it. From a tiny fragment of a fossil, they would construct an entire dinosaur.
Dad's would get all wrapped around the axle because they "discovered" something by snooping, when it didn't matter to their case in chief - the best interests of the children. They would put so much effort and risk into looking for something, their minds would play tricks on their conclusions.
Here is an example of the mindset that sends a Dad down the Rabbithole:
daddyb wrote:Having a logger that is taking screen shots and logging keystrokes can vastly help collect and (possibly uncover unknown) financial information and other information that can come in play at some point in time. Always take steps to be prepared for anything and everything. Install the software. Even if you decide to not spend the time going through it's logs, it's there. One less regret to possibly have later.
Even if you don't look at the logs? Who is going to install a keylogger and not go through the resulting information? How many Dads discover wifey has a secret Swiss Bank Account? None - zilch. How many Dads discover some gossip and flirtation with other men and get lost in the results? Most.
Every divorce is different, and there may be
rare reasons to keep track of wifey on the computer - but none of the information will see the light of a courtroom because it was gathered by extra-legal means. As a general rule, it is a useless waste of time and energy. Spend that time on other more meaningful things, like with the kids activities and Journaling it.