I recommend you do not misappropriate your employer's resources for your own profit. It is both illegal and immoral.
If they are your own servers, sure, but there are downsides. They will consume more electricity while working, and they will run slower (even if you run the process with low priority) because it will be constantly exhausting the CPU cache. If you're okay with that, sure, why not?
Thanks for you reply.
That are my own servers so its no problem and i do not have to pay more money if they consume more electricity.
Most of the servers have modern intel quadcore CPUs and i would only start 2 mining threads per server so it should not affect the server performance.
So i will try it just for the fun
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Is it a good idea to join a mining pool or should i mine alone? I think all servers together should reach 200-300 khash/s without affecting the performance of my other applications.