Which online communication protocol is the safest and most compatible with different platforms/devices?

This document is a spreadsheet that contains various data related to work performance analysis across different departments of a company. The sheet includes columns regarding tasks, the time taken to complete them, and mutual dependencies among employees. It allows one to discern which tasks are the most time-consuming and which departments require additional support to enhance overall productivity. Furthermore, there are proposed training sessions for teams to improve skills and work efficiency. The spreadsheet can be utilized by managers as a decision-making tool for organizational improvements and operational optimizations.