CheckNumber.AI 
Microsoft Checker
microsoft $2 per 10,000 checks
- Core data available
- number, activated
- Best for
- Enterprise-audience segmentation and list cleaning
No-code CSV REST API Exportable results
Verify Microsoft Account Registration
Check whether a phone number is registered on a Microsoft account.
CheckNumber's Microsoft checker tells you whether a phone number is registered with Microsoft services, without messaging or storing the number. Upload a CSV of numbers or call the REST API, and every row comes back with a clear registered or not-registered verdict, ready to clean lists, screen for risk, or route into your CRM.
E.164
Phone input
$2
Per 10,000 checks
CSV + API
Workflow
Submitted number +1425••••6612
Microsoft status yes / no
Microsoft Checker No account, number, or SIM required
Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.
What CheckNumber detects for Microsoft
Microsoft account by phone
Confirms whether a phone number is registered with Microsoft services (yes or no).
Bulk yes/no verdict
Every number comes back with a clear registered or not-registered result, ready to filter and segment.
Passive, no contact
Reads registration signals only. The account holder is never messaged, logged in to, or notified.
What You Can Check
A focused Microsoft registration check
Use the Microsoft task when the required output is a row-level Microsoft-registration signal mapped to each submitted E.164 phone number.
| Microsoft product | Task type | Input | Core data available | Best for | Current price |
|---|---|---|---|---|---|
| Microsoft Checker API documentation | microsoft | Phone numbers in E.164 format | number, activated | Enterprise-audience segmentation and list cleaning | $2 per 10,000 checks |
Core Microsoft data
What the Microsoft task returns
The result file maps one row to each submitted number with the fields below.
Registration
microsoft - Number
- The phone number supplied for the check, in E.164 format.
- microsoft
- Whether the number is registered with Microsoft (yes or no).
The microsoft field is a boolean signal only — it does not distinguish between specific Microsoft services (Outlook, Xbox, Teams) or include account details.
Run a Microsoft batch in three steps
Use the no-code platform for uploaded lists or the REST API for recurring workflows.
- 1
Prepare E.164 numbers
Provide one international phone number per row with country code.
- 2
Create the microsoft task
Upload the file or call the API with task_type set to microsoft.
- 3
Export mapped rows
Download the completed file and match each result to its source number.
Common Use Case
Improve Microsoft list quality before outreach
Verify contact data before enterprise or productivity-tool outreach.
No-code CSV REST API Exportable results
Signal 1
Registration check — confirm in bulk whether each phone number is registered with Microsoft.
Signal 2
List quality — keep only real Microsoft users and drop the rest before outreach.
Signal 3
Privacy-safe — a passive check that never messages, logs in, or notifies the account holder.
Microsoft FAQ
Can I check phone numbers against Microsoft in bulk?
Yes. Upload a CSV of up to hundreds of thousands of numbers or call the REST API, then download a result file with a registered or not-registered verdict for every number. You are billed only for successful checks.
Do you check by phone number or email?
Microsoft is checked by phone number. Upload a list of numbers and each is verified against Microsoft registration.
Does the check contact or notify the person?
No. The check is passive and reads registration signals only. Nothing is sent to the number, and the account holder is never contacted or notified.
Is there a free trial?
Yes. New accounts receive 1,000 free checks on signup with no credit card, and every check is pay-as-you-go with no monthly fee, and the credits you top up never expire.
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