I have worked with excel for over 5 years now in multiple roles within our organization - both as an internal consultant working directly w/the IT team & also as part of my day job managing external consultants who work closely witheveryone involved in this project from start till finish! The best thing about Excel was that it allowed us all to collaborate effectively across departments without having everyone physically gather together at one time or place which sometimes resulted in communication issues between teams due to different schedules etc..
Now we are using Slack so there isn't any need anymore to use excel when communicating internally since slack has made collaboration easier than ever before!!