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Microsoft Ads click fraud protection
Stop click fraud on Microsoft Ads
ClickLens detects invalid Microsoft Ads clicks and grades the conversions that feed automated bidding; exclusion sync and click-id (msclkid) write-back are built and rolling out.
How invalid clicks reach Microsoft Ads
Microsoft Ads runs a search auction much like Google’s, with an msclkid on every click, plus a syndicated partner network that places ads across third-party sites. That partner traffic is where more of the invalid clicks tend to come from, because the quality varies by site. Volume is lower than Google for most advertisers, so a budget-draining attack lands harder when it does hit.
projected annual ad-fraud loss by 2028 (Juniper Research)
of internet traffic is malicious bots (Imperva, 2025)
Microsoft Advertising filters some invalid traffic, but leaves the same gap as Google: the conversions that reach automated bidding are not graded on how they were produced.
How ClickLens protects Microsoft Ads
Microsoft leaves the same gap as Google: the conversions that reach automated bidding are never graded on how they were produced. ClickLens scores each Microsoft Ads session in real time and grades its conversions on provenance, so a fake lead does not quietly train the bidder. The click-id adjustment path keyed by msclkid is built and rolling out alongside exclusion sync; until it is live in production, retractions are reported in the dashboard so the wasted spend is visible while the write-back is finished.
| Capability | Microsoft Ads status |
|---|---|
| Click identifier | msclkid |
| Detection | Live |
| Exclusion sync | Rolling out |
| Conversion write-back | Click-id (msclkid) write-back is built and rolling out, not yet live in production |
See the platform-specific mechanics in the Microsoft Ads integration guide, and how conversion grading works in conversion protection.
From install to protection
Install the tag
Add the ClickLens JavaScript tag to your landing pages. It collects signals on every session, including traffic from Microsoft’s syndicated partner network.
Score every session
The engine classifies each session as human, suspect or bot in real time from 40+ behavioural signals, keyed to the msclkid that brought it.
Grade conversions
Conversions are graded on provenance and journey so a fake lead does not train Microsoft’s automated bidding unchecked.
Sync exclusions (rolling out)
Exclusion sync and msclkid write-back are built and rolling out; today the flagged IPs, placements and retractions are reported for you to apply.
Common questions
Where does click fraud come from on Microsoft Ads?
A large share rides in through Microsoft’s syndicated partner network, where ads run on third-party sites of varying quality. ClickLens scores that partner traffic on your own landing pages, the same way it scores clicks from Bing search.
Can ClickLens sync exclusions to Microsoft Ads yet?
Exclusion sync and click-id (msclkid) write-back are built and rolling out, not yet live in production. Until they are, ClickLens reports the fraudulent IPs and placements in the dashboard, along with the conversion retractions, for you to apply.
Does Microsoft Ads protect automated bidding from fake conversions?
No. Like Google, Microsoft does not grade conversions on how they were produced, so a fake lead trains the bidder as if it were real. ClickLens grades each conversion on provenance to break that loop.
Related terms
See how much Microsoft Ads spend reaches a real person
Install one tag and ClickLens scores every Microsoft Ads session and conversion in the open. Free plan with 1,000 sessions a month, no credit card.
Sources
- Juniper Research (reported by Search Engine Land), “$84 billion of ad spend lost due to ad fraud in 2023” , September 2023. Accessed 26 June 2026. searchengineland.com
- Imperva (Thales), “2025 Imperva Bad Bot Report” , 2025. Accessed 26 June 2026. imperva.com