Microsoft Office 2019 Professional Plus is a robust suite that includes applications like Word, Excel, PowerPoint, and Outlook, suitable for users who prefer a one-time purchase without ongoing updates. In contrast, Microsoft Office 2021 Pro Plus introduces additional features and improvements such as enhanced collaboration tools and updated user interfaces. Office 2021 Pro Plus is designed for users who want the latest software enhancements and support for modern workflows.

Yes, Office 2021 for Mac is fully compatible with macOS, offering a range of benefits such as improved performance and integration with macOS features. Users can enjoy the latest updates, refined user interfaces, and seamless synchronization across devices. This version also includes features tailored for macOS users, ensuring an optimized experience on Apple devices.

To activate your Microsoft Office 2021 Pro Plus product key, first, install the software from the official Microsoft website or a licensed distributor. Once installed, open any Office application, such as Word or Excel. When prompted, enter your product key, and follow the on-screen instructions to complete the activation process. Ensure you have a stable internet connection during activation for verification purposes.

If your Microsoft Office product key is not working, check that you have entered it correctly and ensure it matches the version of Office you are trying to activate. If the key is still invalid, visit Microsoft's support page or contact their customer service for assistance. It may be helpful to provide proof of purchase or details about your installation to resolve any issues effectively.

Occasionally, promotions or discounts for Microsoft Office 2021 Pro Plus may be available through official Microsoft channels or authorized resellers. Keep an eye on special offers, seasonal sales, or bundle deals that might provide savings. Subscribing to newsletters from Microsoft or authorized retailers can also keep you informed about the latest discounts and promotional events.

MS Office 2021 introduces several new features and enhancements compared to previous versions:

1. Improved Collaboration Tools: Enhanced co-authoring and real-time collaboration features allow multiple users to work on the same document simultaneously, making team projects more efficient.

2. Updated Excel Functions: New functions such as XLOOKUP, LET, and dynamic arrays provide more powerful data analysis and manipulation capabilities.

3. Advanced PowerPoint Features: Enhanced Presenter View and new design options in PowerPoint help create more engaging and professional presentations. The integration of PowerPoint Designer and improved transitions add a polished touch to slides.

4. Enhanced Dark Mode: Office 2021 offers a more refined dark mode across applications, reducing eye strain and improving visibility in low-light environments.

5. Improved Inking Tools: Upgraded inking tools in Word, Excel, and PowerPoint provide smoother and more precise drawing and annotation experiences.

6. Updated User Interface: The interface has been streamlined and modernized, with new icons and improved accessibility features, making it easier to navigate and use the applications.

7. Security and Performance Enhancements: Office 2021 includes improved security features to protect data and enhance overall performance for a smoother user experience.

These updates aim to improve productivity, collaboration, and user experience across the Office suite.