Your Microsoft Ads campaigns, formerly Bing Ads, show healthy lead volume, but sales keeps rejecting the same batch of junk form fills from syndicated search partners and Microsoft Audience Network placements, and your team is stuck adding exclusions one domain at a time. If you want to stop spam leads from Microsoft Ads before they reach your CRM, the first step is finding out how much of your spend is actually exposed, and Lunio's free click fraud calculator can give you an estimate in minutes.

Key Facts

• Microsoft Ads IVT rate: per Lunio's 2026 Global Invalid Traffic Report, based on 2.7 billion paid clicks analyzed across 2024-2025, Microsoft Ads, labelled "Bing" in the report, recorded an invalid traffic rate of 10.32%, measured after Microsoft's own click filtering already ran.

• Cross-platform reference rate: per the same report, the average invalid traffic rate across all platforms is 8.51% of paid ad clicks, the baseline figure to compare any single channel against.

• Lead-gen exposure: per Lunio's 2026 Global Invalid Traffic Report, lead generation advertisers see average invalid traffic rates 32.07% higher than other advertisers.

• Free diagnostic: Lunio's 14-Day Free Traffic Audit shows your own Microsoft Ads invalid traffic rate, broken down by campaign, keyword, geo and domain, before you commit any budget.

Three Kinds of Spam Leads on Microsoft Ads, and Why Each Needs a Different Fix

Spam leads showing up in your Microsoft Ads CRM data usually come from three different causes, and conflating them wastes time. The first is invalid traffic (IVT) at the click level: General Invalid Traffic (GIVT) from known bots and crawlers a static list can catch, and Sophisticated Invalid Traffic (SIVT), disguised bots, hijacked devices and deliberate clicks engineered to look genuine, that also submit a form. The second is bot form submissions that never came through a paid click at all. The third is a real but uninterested human who clicked and filled out a form: that is wasted spend from poor targeting or weak keywords, not invalid traffic, and no traffic tool fixes it.

Doesn't Microsoft Advertising Already Filter This?

Microsoft Advertising sorts every click into standard-quality, low-quality, or invalid, and per Microsoft's own documentation, automatically credits clicks it identifies as invalid. Clicks billed and later found low-quality or invalid are still credited, but Microsoft states they "will remain listed in your reports as 'standard-quality clicks,'" so the low-quality click column shows only what Microsoft caught, not what it missed. One Microsoft support representative admitted on Microsoft Q&A: "we can't guarantee every instance of low quality, fraudulent activity or suspicious traffic will be caught." Lunio's monitor-only data, recorded after Microsoft's own filtering already ran, put Microsoft Ads at 10.32% IVT per Lunio's 2026 Global Invalid Traffic Report, above the 7.57% average Lunio reports for Google Ads. Platform filters also tend to catch known bots and crawlers (GIVT) more reliably than disguised, sophisticated invalid traffic (SIVT).

Where Microsoft Ads Traffic Comes From: Microsoft Sites, Syndicated Search Partners and the Microsoft Audience Network

Microsoft Ads traffic reaches your landing page through three different sources, and each carries a different spam-lead risk:

• Microsoft owned sites: Bing, MSN and Outlook.com, included under both ad distribution options.

• Syndicated search partners: added in full only under "The entire Microsoft Advertising Network," including Microsoft Bing and Yahoo search partners such as Ask.com and Forbes, for extended reach and lower cost per click.

• Microsoft Audience Network placements: audience ads that can appear on MSN, Outlook.com, Microsoft Edge and other partner placements, sometimes even from search campaigns.

"Microsoft sites and select traffic" is not a Microsoft-only switch: it still includes select partner traffic Microsoft describes as performing similarly to Bing, so check the Website URL (publisher) report to see which partners actually served your ads.

How to Stop Spam Leads From Microsoft Ads: Diagnose by Domain First

Before changing any setting, diagnose where your spam leads actually originate with three steps. For a wider native toolkit, see 15 free Microsoft Ads tools.

1. Run the Website URL (publisher) report to list every domain that served your ads.

2. Export those domains and match them by hand against which leads your CRM marks qualified, since the report shows placements, not lead quality.

3. Compare Microsoft-reported clicks with landing-page sessions and server logs per domain. Microsoft support staff confirm a recorded click and a recorded website visit "are not necessarily the same event," and advertisers can raise a click-quality investigation with that evidence if the gap is large.

The Website URL (publisher) report shows where your ads ran, but joining it to click-level invalid traffic by hand takes time most teams don't have. Get Lunio's Free 14-Day Traffic Audit and see your own Microsoft Ads invalid traffic broken down by campaign, keyword, geo and domain, plus the top offending IP addresses, before you touch a single exclusion.

Native Microsoft Ads Controls, Step by Step, and Where Each One Stops

Six native settings reduce spam-lead exposure without any third-party tool; for more tactics, see Microsoft Ads unlocked: proven tactics and better CPA.

• Switch ad groups to "Microsoft sites and select traffic" to drop the wider syndicated partner network.

• Add website exclusions, at campaign or account level, for domains that produce no qualified leads.

• Minimize Microsoft Audience Network delivery from search campaigns by combining the distribution setting with website exclusions for audience placements that appear, since bid modifiers no longer block this delivery.

• Add IP address exclusions for repeat offenders, limited to 100 IPv4 addresses or ranges per campaign, with only the last octet available as a wildcard.

• Enable MSCLKID auto-tagging and import qualified-lead outcomes as an offline conversion goal, uploaded daily, so automated bidding learns from real sales outcomes instead of junk conversions logged through the UET tag.

• Add a honeypot field or other form-layer check to stop obvious bot submissions from counting as conversion goals.

Each control has a hard stop. "Microsoft sites and select traffic" still carries partner traffic, website exclusions only cover domains you already know about, and the Microsoft Audience Network has no universal opt-out, only mitigation through settings and exclusions. IP exclusions cap at 100 entries per campaign and only catch addresses already identified. Offline conversion import needs developer work to carry MSCLKID through to the CRM record, and a honeypot field stops bot form submissions but does nothing about the paid click behind them or human-run form farms.

What Invalid Traffic Costs at Your Microsoft Ads Spend Level

At $40,000 in monthly Microsoft Ads spend, the 8.51% cross-platform reference rate equals roughly $3,404 a month exposed to invalid traffic, per Lunio's 2026 Global Invalid Traffic Report, before counting sales time on junk leads or the cost of automated bidding trained on fake conversions. The same report found lead generation advertisers see average invalid traffic rates 32.07% higher than other advertisers, and the wider costs of wasted spend are explored further in the true cost of wasted ad spend. That $3,404 figure is a cross-platform average, not a Microsoft Ads measurement, so replace it with your own number before deciding which partners or placements to keep. Talk to sales about protecting your spend.

Measuring Invalid Traffic on Your Microsoft Ads Account With Lunio

Lunio monitors 100% of the paid traffic your Microsoft Ads campaigns send to your site and assesses every click it records. Suspicious activity is rechecked before any exclusion is applied, and Lunio's false-positive rate is under 1%, the trade-off every blocking system makes against missing genuine invalid traffic. Funding Circle, a lending platform running Google and Microsoft Ads together, saved 5.8% of spend across Google and Microsoft Ads combined, not a Microsoft-only figure, and saw a 10% increase in MQL conversion rate (from impression to MQL). Lunio tackles invalid traffic as a marketing problem, not a security one, and does not filter form submissions or match sessions to CRM lead status.

Spam Leads From Microsoft Ads by Industry

Spam-lead patterns on Microsoft Ads differ by industry, and each page below covers one industry in detail.

• Microsoft Ads spam leads in education: covers fake or unqualified student inquiries and prospectus requests.

• Microsoft Ads spam leads in finance and insurance: covers fake quote and application leads.

• Microsoft Ads spam leads in real estate: covers fake viewing and valuation requests.

• Microsoft Ads spam leads in recruitment and HR: covers fake applicants and bot applications on job ads.

• Microsoft Ads spam leads in telecoms and utilities: covers fake switching, sign-up and quote leads.

Conclusion

Microsoft's own documentation confirms that clicks credited after billing still appear in your reports as "standard-quality clicks," and Lunio's monitor-only data puts Microsoft Ads at 10.32% invalid traffic measured after that filtering already ran. The syndicated search partners and audience placements that make Microsoft Ads worthwhile are the same ones you need to measure directly before you stop spam leads from Microsoft Ads for good. Start Lunio's Free 14-Day Traffic Audit and find out which domains to keep and which to cut.

FAQ

Can I show Microsoft Ads only on Microsoft's own sites?

Not currently. The "Microsoft sites and select traffic" distribution option includes Bing, MSN and Outlook.com, but it also includes select partner traffic that Microsoft describes as performing similarly to Bing. There is no distribution setting that restricts delivery to Microsoft-owned properties alone. To see exactly which partner domains served your ads, run the Website URL (publisher) report and review the full placement list before adding exclusions.

Can I turn off Microsoft Audience Network ads for search campaigns?

There is no universal opt-out. Microsoft support staff have confirmed that bid modifiers which once blocked Microsoft Audience Network delivery from search campaigns no longer work, and search ads can become eligible for audience placements like MSN, Outlook.com and Microsoft Edge by default. The practical route is combining the "Microsoft sites and select traffic" distribution setting with website exclusions for the specific audience placements that appear, then contacting Microsoft support about account-level options.

Why does Microsoft Ads report more clicks than my site sessions?

Microsoft support staff state directly that a recorded ad click and a recorded website visit are not necessarily the same event. Gaps can come from page load failures, tracking issues, or invalid clicks identified and credited after billing, which still remain listed in reports as "standard-quality clicks." If server logs or MSCLKID tracking show a large, consistent gap for a specific domain, Microsoft invites advertisers to raise a click-quality investigation with that evidence attached.

Is Lunio's 14-day traffic audit a trial, and does it help with spam leads?

It is a 14-day measurement period on your live Microsoft Ads account, not a traditional free trial of software you keep afterward. Lunio monitors your traffic and shows your own invalid traffic numbers, broken down by campaign, keyword, geo and domain, before any conversation about requirements or pricing. That makes it a diagnostic step for spam leads specifically: you see which campaigns, keywords, geos and domains carry the most invalid traffic, then compare them with the junk form fills your sales team rejects, before you commit budget to fixing them.