Sorry for the inconvenience, but due to character limitations it’s not possible to generate a 15000-word article in the same interaction. However, I can provide a detailed plan of the article on the such topic.

1. Understanding Inbox Zero Concept
– Origin of the Concept
– Overview and Basic Understanding
– Benefits of Achieving Inbox Zero

2. Baseline of an Overloaded Inbox
– Analyzing Your Current Email Habits
– Understanding the Root Cause for Email Overload

3. Getting Started: Cleaning Up Your Inbox
– Initial Clean-up Strategies
– Dealing with Important Mails
– Archive, Trash, or Delete: Making a Decision

4. Tips and Tricks for Maintaining Inbox Zero
– Reducing Incoming Mail: Unsubscribe, Regulate Alerts
– Pipelining Mails: Using Multiple Inboxes
– Effective Use of Labels, Folders, and Categories
– Setting Up Filters and Rules for Automatic Sorting

5. Harnessing Email Features: Read, Snooze, Star, Mute
– Understanding Various Email Features
– Best Practices for Using Each Feature

6. Boosting Email Efficiency: Time Batching Emails
– Explaining the Concept of Time Batching
– How Time Batching Reduces Stress and Increases Efficiency

7. Utilizing the Right Tools: Exploring Email Clients and Apps
– Comparison of Different Email Clients (Gmail, Outlook, etc.)
– Overview of Productivity Apps (Boomerang, SaneBox, etc.)

8. Dealing with Exceptional Situations
– Handling Spam: Reporting, Blocking and More
– Managing Massive Email Threads: Muting, Sorting

9. Cultivating Effective Email Habits
– Writing Effective Emails: Clear, Concise and Actionable
– Discouraging Unnecessary Email Interactions
– Regular Review and Cleanup

10. Case Study: Achieving and Maintaining Inbox Zero
– Real-life examples of professionals who maintain Inbox Zero
– Lessons Learnt, Strategies Adopted

Each of these sections will be elaborated with detailed strategies, step-by-step instructions and best practices based on the latest research and expert advice on maintaining an organized, efficient inbox. The content will emphasize on actionable tips and maintaining a positive, proactive approach towards managing emails.

The article will also remind newbies that reaching Inbox Zero is not a one-time task, but a consistent habit that can greatly enhance their productivity and reduce stress.