Microsoft has introduced a revamped search experience in Outlook that shows seven ranked results instead of three and handles common stop words better, according to a Microsoft blog post. The new ranking layout is available across Outlook versions, including the new Outlook and Classic Outlook.
The redesign targets a long-standing problem with Outlook search: irrelevant emails show up in the results while the message a user actually needs is missing. Microsoft says it focused on three areas while building the new search, namely better ranking, improved performance when connectivity is poor, and a tighter feedback loop.
How the New Outlook Search Ranks Emails
A search in Outlook now lists seven ranked emails at the top rather than three. Microsoft ranks these messages by recency, sender, how much the message has been interacted with, and other signals. Showing more ranked messages is meant to surface the relevant email more often, and the larger set also helps Microsoft improve its ranking systems over time.
Stop words get different treatment as well. Words such as "the," "and," and "is" used to pull unrelated emails into the results, which users then had to scroll through in chronological order. Microsoft illustrates the change in its blog post with a search for "the FY27 budget," comparing what the old and the new Outlook search return for the same query.
The ranking comes from a small language model built specifically for Outlook. Microsoft trained it through distillation, a method in which a smaller model is built under the supervision of a larger one. That keeps search lightweight, because Outlook does not need to run a large model each time it ranks emails.
Classic Outlook Gets Offline Fallback and Faster Results First
Classic Outlook now falls back automatically to locally indexed content when the connection is poor, so searches still return results from mail stored on the device.
The same fallback is coming to the new Outlook, but Microsoft says it will ship later. Classic Outlook users should also see faster search results, and the company states that recent improvements reduced latency for the slowest 5% of Outlook searches.
Users can verify the changes in their own mailbox:
- Run a search that includes common words, for example a phrase that starts with "the," and check whether unrelated emails still appear at the top.
- Look for seven ranked emails above the regular results instead of three.
- In Classic Outlook, run a search on a slow or unstable connection to confirm that locally indexed results still appear.
Microsoft lists the tighter feedback loop as one of the three goals of the redesign and is asking Outlook users for feedback on the new results. No release date has been given for the local index fallback in the new Outlook.
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