Copilot vs Outlook Search: How to Search All Your Emails in 2026

Microsoft now gives you two built-in ways to search Outlook: the traditional search bar and Copilot. One is fast but dumb. The other is smart but slow. Neither is ideal if you just need to find a specific email without remembering the exact wording. Here's how each option works, where they fall short, and what to do when both leave you scrolling.

How do you search for emails in Outlook?

The search bar has been in Outlook for decades, and it still works the same way. Press Ctrl+E (Windows) or Cmd+E (Mac) to focus the search field, type a keyword, and press Enter. Outlook checks your emails for that exact word and returns whatever matches.

You can narrow results with search operators: from:sarah limits results to a specific sender, subject:invoice searches subject lines only, and hasattachment:yes filters to emails with files attached. In classic Outlook, you can combine terms with AND, OR, and NOT. These operators work in New Outlook and Outlook on the web too, though behavior varies slightly by version.

For most people, this is enough — until it isn't. The moment you can't remember whether someone said "budget" or "spend" or "allocation," keyword search becomes guesswork.

How do you search all folders and mailboxes in Outlook?

One of the most common frustrations with Outlook search is that it defaults to the current folder only. If you're looking at your Inbox and the email you need is in a subfolder or Sent Items, it won't show up. You need to change the search scope to search all your email.

Classic Outlook for Windows

Click the search bar, then look at the Search tab that appears in the ribbon. Click All Mailboxes to search everything — every folder, every account. You can also pick Current Folder, All Subfolders, or All Outlook Items (which includes contacts, calendar events, and tasks).

New Outlook for Windows

Click the search bar and look for the scope dropdown just below it. Change it from Current Folder to All Mailboxes. New Outlook runs search server-side against Microsoft's cloud, so it can find emails that haven't been synced locally — but it can also miss older messages when there are too many results.

Outlook on the web

Click the search bar, then select All from the scope dropdown. This searches across your entire mailbox including Inbox, Sent Items, Drafts, Archive, and any custom folders.

If you have multiple email accounts connected, searching all mailboxes covers every account at once. For a deeper walkthrough of multi-account search, see our guide on how to search multiple accounts at once in Outlook.

What does Copilot actually do in Outlook?

Microsoft 365 Copilot arrived in Outlook as a conversational AI assistant. Instead of typing keywords into a search bar, you can ask Copilot a question in plain English — "What did Sarah say about the Q3 budget?" or "Find the email with the conference agenda from last month" — and it generates an answer by analyzing your mailbox.

Copilot does several things well. It can summarize long email threads so you don't have to read 40 replies to find the decision that was made. It can draft replies based on the conversation context. And it can answer questions about your email that would take ages to piece together manually — "When is my next flight?" or "What action items did the team assign me this week?"

For these use cases, Copilot is genuinely useful. It's not a search tool — it's an assistant that happens to read your email.

Is Copilot good for searching emails?

The trouble starts when you try to use Copilot as a replacement for Outlook search. If your goal is to find a specific email — not summarize a thread or get a general answer, but locate one particular message — Copilot has some real drawbacks.

The biggest one is speed. Every Copilot query travels from your machine to Microsoft's cloud servers, gets processed by a large language model, and comes back. That round-trip takes several seconds per response. When you're hunting for a specific email and need to refine your search a few times, those seconds stack up fast. Native Outlook search returns results in under a second. So does any search tool with a local index.

Then there's cost. Copilot requires a Microsoft 365 Copilot license at $30/user/month on top of your existing Microsoft 365 subscription. For an organization of 50 people, that's $18,000 a year. If your main use case is "find emails better," that's an expensive search bar.

There's also a mismatch in what Copilot returns. Ask it to "find the email from Sarah about the contract" and you'll often get a summary of what Sarah said — not a direct link to open the email itself. Copilot is built to answer questions, not to surface specific messages. When you need to forward that exact email or check a detail in the original, a summary isn't enough.

Accuracy is another concern. Large language models sometimes reference emails that don't exist or conflate details from different threads. In a casual chat with an AI, a small error is harmless. When you're looking for a specific document or confirming what someone said in writing, that margin of error matters.

Finally, there's the privacy angle. Copilot processes your queries and email content on Microsoft's servers. Microsoft states that data stays within your tenant boundary and isn't used to train models, but the processing still happens remotely. For users or organizations with strict data residency requirements, that's worth considering.

What are the limits of Outlook's built-in search?

Copilot's limitations might send you back to the regular search bar — but native Outlook search has well-documented issues of its own:

• Keyword matching only. If the email says "booking confirmation" and you search "hotel reservation," Outlook won't find it. It matches words, not meaning.
• Prefix matching. Outlook matches from the start of words. Searching "port" finds "portfolio" but searching "folio" finds nothing. For more on this, see our article on why Outlook ignores exact words.
• Missing results. New Outlook's server-side search can silently drop older emails from results when there are too many matches.
• No date sort in New Outlook. Search results are ranked by "relevance" with limited ability to re-sort by date.
• Index problems. Classic Outlook relies on the Windows Search index, which can break, stall, or fall behind — requiring a manual rebuild.

So native search is fast but limited. Copilot is smarter but slow and expensive. Is there a middle ground?

Is there a faster way to search Outlook by meaning?

Inbox Search is an Outlook add-in built specifically for this gap. It uses on-device AI to understand what your search means — similar to how Copilot understands natural language — but runs the entire process locally on your machine. No cloud round-trip, no waiting several seconds for a response, no extra subscription.

Search "travel expenses from the Berlin trip" and it finds relevant emails even if none of them contain those words. Search an exact name or invoice number and that exact match ranks first. It combines semantic embeddings with keyword matching (TF-IDF), so you get the precision of traditional search alongside the recall of AI understanding.

Because everything runs locally via Transformers.js, your email content never leaves your device. There's no external server processing your queries. And because it's an Outlook add-in from Microsoft Marketplace, it works inside the Outlook interface you already use — Windows, Mac, and Outlook on the web.

How do Outlook Search, Copilot, and Inbox Search compare?

Which search method should you use?

It depends on what you're trying to do. If you know the exact keyword, sender, or subject line, native Outlook search is the fastest path. It's built in, it's instant, and with the right search operators it handles straightforward lookups well. No reason to overthink it.

Copilot earns its keep when you need to summarize a long thread, draft a reply in context, or ask a broad question like "What's the status of the Henderson project?" It pulls together information from multiple emails and presents a coherent answer. Think of it as an assistant that reads your inbox for you — not a search engine.

Where neither option covers you is the middle ground: you need a specific email, but you can't quite remember the wording. That's where Inbox Search fits. It gives you the semantic understanding of Copilot with the speed of native search — and without the $30/month price tag. For a broader look at how it stacks up against other tools, see our full comparison.

Frequently asked questions

Can Copilot search all my emails in Outlook? Copilot can answer questions about your emails using natural language, but it's not a traditional search tool. It processes queries through Microsoft's cloud servers, which means each response takes several seconds. It also tends to summarize or paraphrase rather than showing you the specific email you're looking for. For quickly locating a particular message, native Outlook search or a dedicated search add-in like Inbox Search is faster.

How do I search all folders in Outlook? In classic Outlook, click the search bar (or press Ctrl+E), then click the Search tab in the ribbon and select "All Mailboxes" or "All Outlook Items." In New Outlook, click the search bar and change the scope dropdown from "Current Folder" to "All Mailboxes." In Outlook on the web, click the search bar and select "All" from the scope options. This searches every folder including Inbox, Sent Items, Drafts, and any custom folders.

Is Copilot worth it just for email search? If your only goal is finding specific emails faster, probably not. The $30/user/month Copilot license is designed for a much broader set of features — summarization, drafting, meeting prep, and cross-app AI assistance across Word, Excel, Teams, and more. For dedicated email search with semantic understanding, Inbox Search is a free alternative that runs locally and returns results instantly.

What is the fastest way to search Outlook? Press Ctrl+E (or Cmd+E on Mac) to open the search bar and use operators like from:, subject:, and hasattachment:yes to narrow results. For searches where you don't remember the exact wording, Inbox Search is an add-in that uses on-device AI to match by meaning — with the same instant response time as native search, because everything runs locally.