---
title: "MicrosoftPreview: user agent and token | Agent Ready Crawlers"
description: "MicrosoftPreview from Microsoft: exact user-agent string, robots.txt token MicrosoftPreview, other purpose and how to verify it. 4.0% of top sites block it."
canonical: https://agentreadycrawlers.com/crawlers/microsoftpreview
site: "Agent Ready Crawlers"
last_updated: 2026-11-04
section: "Crawlers"
---

# MicrosoftPreview: user agent and token | Agent Ready Crawlers

> MicrosoftPreview from Microsoft: exact user-agent string, robots.txt token MicrosoftPreview, other purpose and how to verify it. 4.0% of top sites block it.

Source: https://agentreadycrawlers.com/crawlers/microsoftpreview
Site: Agent Ready Crawlers
Last reviewed: 2026-11-04

Bot from Microsoft

# MicrosoftPreview

In short

MicrosoftPreview is Microsoft's bot, filed under Other. The token to write in robots.txt is MicrosoftPreview. Verify it by reverse DNS, then a forward lookup. 4.0 percent of 5,938 top-10,000 sites with a parsed robots.txt disallow it at the root (crawl of 2026-11-04). MicrosoftPreview is covered by Bing's general robots.txt guidance for its crawlers.

Operator

[Microsoft](https://agentreadycrawlers.com/crawlers/operator/microsoft/) Vendor profile: [Microsoft](https://agentreadycrawlers.com/vendors/microsoft/)

Purpose

Other [All other rows](https://agentreadycrawlers.com/crawlers/purpose/other/). Link previews, ad checks, dataset crawls, SEO tools and legacy tokens that fit none of the five purposes.

User-agent string

`Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; MicrosoftPreview/2.0; +https://aka.ms/MicrosoftPreview) Chrome/W.X.Y.Z Safari/537.36`

robots.txt token

`MicrosoftPreview` Matched case-insensitively (RFC 9309). The token and the user-agent string are different things.

Respects robots.txt

Yes, per operator

Covered by Bing's general robots.txt guidance for its crawlers. [Source](https://www.bing.com/webmasters/help/which-crawlers-does-bing-use-8c184ec0), read 2026-11-04.

Verification

Reverse DNS

Reverse-resolve the source address, then forward-resolve the name and require the same address. [Documentation](https://www.bing.com/webmasters/help/how-to-verify-bingbot-3905dc26), read 2026-11-04.

IP ranges

Not published.

Rate behaviour

Not published.

Block rate

**4.0%** of 5,938 top-10,000 sites with a parsed robots.txt disallow `MicrosoftPreview` at the root (235 sites). 0.0% name it; 3.9% refuse it only through a \* group. Rank 29 of 31 tokens measured.

Across all 8,624 parsed robots.txt files in the crawl: 2.9% (0.0% named). Crawl of 2026-11-04; [report](https://agentreadycrawlers.com/block-rates/).

Documentation

[bing.com](https://www.bing.com/webmasters/help/which-crawlers-does-bing-use-8c184ec0), read 2026-11-04.

Note. Generates page snapshots for Microsoft products; desktop and mobile variants.

## Allow and refuse lines

### To allow MicrosoftPreview

User-agent: MicrosoftPreview
Allow: /

### To refuse MicrosoftPreview

User-agent: MicrosoftPreview
Disallow: /

Refusing or allowing in robots.txt states a preference. Enforcement of a refusal belongs in your WAF; see how to verify the identity above.

## Microsoft in the Verification Ledger

bingbot.json (creationTime 2024-01-03) and a verification tool; nothing for Browse with Copilot. [All operators](https://agentreadycrawlers.com/verification/).

IP lists

-   [www.bing.com/toolbox/bingbot.json](https://www.bing.com/toolbox/bingbot.json)

Reverse DNS

Verify Bingbot tool and documented methods

Key directory

not published

Cloudflare

not checked

Visa TAP registry

no public operator-level registration found (checked 2026-11-04)

Mastercard Agent Pay

no public operator-level registration found (checked 2026-11-04)

## Other Microsoft rows

-   [Bingbot](https://agentreadycrawlers.com/crawlers/bingbot/) Search index token bingbot
-   [Browse with Copilot (formerly Copilot Actions)](https://agentreadycrawlers.com/crawlers/copilot-actions/) Task agent no token

## Sources

-   [Which Crawlers Does Bing Use?](https://www.bing.com/webmasters/help/which-crawlers-does-bing-use-8c184ec0) read 2026-11-04
-   [bing.com: how to verify bingbot 3905dc26](https://www.bing.com/webmasters/help/how-to-verify-bingbot-3905dc26) read 2026-11-04

Last reviewed 2026-11-04