I work in a high tech software engineering in a small RnD group which is a part of a group of about 50 people of different functions. In our small team we tried multiple project management software for documentation, tracking, knowledge base etc. None of them survived mainly because others are averse to using them. Outlook is de facto our replacement of Slack/JIRA/wiki etc. We use it for both internal and external communications in conjunction with Webex for meetings and PowerPoint for docs. We have a tracking system for bugs, but the life isn't happening there, they are just to mark state of the issue and to have a list of issues, without real info about implementation, discussion and so on.
The problem is - this is not an ideal collaboration way per any of modern methodologies. We tried to fight against it for years but without success. I start to think that it is because Outlook is actually sufficiently good. Please assess this statement based on your experience.