Recommendations for document management and communications administration

Reaching out the community for feedback on solutions you've used for: 1. Document management For documents issued by each party to deliver the contract services. E.g., planning documents, reports, meeting minutes/actions. 2. Communications administration To record the emails back and forth between the parties in relation to the contract services. Possible solutions could range from group email and SharePoint through to e.g., 'Aconex'. What have you seen used? What works well?