All three are safe, frequently updated, and free of malware.

The version released in 2015 introduced several "modern" features that are now standard: Real-time Collaboration: Multiple users could edit a Word document simultaneously. Smart Lookup:

In the mid-2010s, Microsoft transitioned from traditional standalone software to the cloud-based Office 365

Using unlicensed Microsoft software violates Microsoft’s terms of service. While individual users rarely face lawsuits, businesses can be audited and fined.