I totally agree with your friend. I say to those starting out that your network is your (business) life! It’s how you build and maintain your network and support people in it that will come back to you in positive ways in your life. I’ve kept my notes in a similar way in outlook. Not ideal I know, but combined with search and LinkedIn, it’s served me well.
Supporting your network in their endeavours shows the power of the network and it does come back.
I wish they would teach this to everyone…..