Smart Ranking of Emails and Files Based on How You Click

IBM's 1999 patent on automatically sorting lists of items, like emails, by watching which ones you click first and updating a mathematical model of your preferences in the background.

What it covers

The system observes the order in which a user accesses a first set of objects, such as opening emails in an inbox, and compares this sequence to an 'access hypothesis'—a baseline expectation of how the user would normally browse them (Claim 1). If the user deviates from this baseline (for example, skipping the top three emails to click a receipt further down), the system adapts a 'preference model' (Claim 1). It does this by applying a 'bonus value' to the features of the early-accessed item (Claim 4) and a 'penalty value' to the skipped items (Claim 9). These updated weights, stored in feature vectors, are then used to calculate preferences and re-rank a second set of incoming items (Claim 1).

What it doesn't cover

• —Does not cover ranking systems that rely purely on explicit user feedback, such as star ratings, likes, or manual folder sorting.
• —Does not cover static ranking systems that do not update their underlying preference models dynamically based on user behavior.
• —Does not cover systems where the baseline expectation (access hypothesis) is not compared against the actual sequence of user interactions.
• —Does not cover ranking methods that do not use feature vectors to represent the attributes of the items being sorted.

The clever bit

Instead of just tracking what you click, the system compares your actions to an 'access hypothesis' (like assuming you will read top-to-bottom). By measuring how much you deviate from this baseline, it filters out the bias of screen layout.

Why it matters

This patent represents an early foundation for algorithmic feeds and smart inboxes. Long before modern AI-driven social media feeds, IBM patented the core loop of implicit feedback: watching what a user ignores or clicks to silently re-order their view. It directly relates to features like Gmail's Priority Inbox or Outlook's Focused Inbox.

Real-world examples

• 1.Gmail's Priority Inbox sorting
• 2.Microsoft Outlook's Focused Inbox
• 3.Algorithmic sorting of search results in enterprise databases