Real-time
Two-way sync
Changes in Klaviyo or Microsoft 365 instantly reflect in both systems. No stale data, no manual imports.
Business productivity
Klaviyo to Microsoft 365 integration — real-time, two-way sync
Keep Klaviyo and Microsoft 365 in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
- SOC 2 and 6 other compliance frameworks
- POC with real engineers in minutes
Adopted by fast-scaling companies moving mission-critical data in real time
Case study
Migrated from Mulesoft
Case study
Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
Case study
Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Klaviyo and Microsoft 365
Stop re-entering the same information in Klaviyo and Microsoft 365: Stacksync keeps the records they share consistent in real time, in both directions.
Two tools in the daily stack often hold overlapping information: the same people, the same companies, or the same pieces of work, described twice. The tools do different jobs, so consolidating is not the answer; the overlap just needs to stop drifting.
Stacksync syncs Flows, Templates, Catalog Items, Tags in Klaviyo with Teams, Planner & To Do Tasks, Users, Groups in Microsoft 365 in real time. You choose which records overlap, map the fields that should match, and pick a direction or let changes flow both ways. From then on, an update made in either tool is reflected in the other within seconds, without exports or copy-paste.
Because the sync is field-level, each tool keeps its own extras; only the shared data is held in agreement.
Common use cases
- Keep suppression and consent status consistent between Klaviyo and other email or SMS tools
- Sync catalog items from an ERP or PIM so product recommendations and back-in-stock flows use current data
- Mirror calendar events into scheduling or CRM tools so meetings appear on customer timelines.
- Sync SharePoint lists with operational databases so business users edit in SharePoint while systems read SQL.
Where one tool produces events: mirror them in the other
Payments, replies, messages, or tickets created in one tool can create or update matching records in the other, keeping context in one place.
Where Microsoft 365 is where the team documents or plans: keep its data fed
Information that originates in Klaviyo stays current in Microsoft 365 instead of going stale after a one-time paste.
Handoffs between teams
When work started in one tool continues in the other, the shared fields travel with it automatically.
What you can sync between Klaviyo and Microsoft 365
Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.
| Klaviyo objects | Microsoft 365 objects | |
|---|---|---|
| Metrics Event type definitions organize the activity stream used in segmentation and attribution. | Contacts Personal and org contacts kept consistent with CRM contact records. | |
| Campaigns Email and SMS sends expose performance data for warehouse-based reporting. | OneDrive Files (driveItems) File and folder metadata synced for document workflows and audits. | |
| Flows Automation definitions and their engagement data sync outward for attribution. | SharePoint Sites & Lists List items read and written like lightweight database tables. | |
| Templates Message templates are accessible via API for content management workflows. | Teams Team and membership data provisioned from upstream systems. | |
| Catalog Items Product catalog records synced from an ERP or PIM power product blocks and back-in-stock triggers. | Planner & To Do Tasks Task items synced with project and work-management tools. | |
| Tags Organizational labels on campaigns, flows, and lists support reporting rollups. | Users Entra ID user accounts synced with HR and identity systems. |
What ships with Klaviyo ⇄ Microsoft 365
Connect Klaviyo and Microsoft 365 for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Klaviyo–Microsoft 365 connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Klaviyo or Microsoft 365 data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.
At scale
Event queues
Handle millions of events per minute without losing a single Klaviyo or Microsoft 365 record.
Observability
Monitoring
Track your Klaviyo ⇄ Microsoft 365 sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Klaviyo and Microsoft 365.
How the Klaviyo and Microsoft 365 connectors work
Klaviyo
- Integration surface
- REST API compliant with the JSON:API specification
- Authentication
- OAuth 2.0 for apps or private API keys
- Change detection
- Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions
- Capabilities
- read · write · webhooks
- Rate limits
- Per-endpoint burst and steady rate limits apply
Microsoft 365
- Integration surface
- REST API (Microsoft Graph)
- Authentication
- OAuth 2.0 via Microsoft Entra ID, with delegated or application permissions
- Change detection
- Graph change notifications (webhooks) plus delta queries for incremental sync
- Capabilities
- read · write · webhooks
How it works
How to connect Klaviyo to Microsoft 365 — three steps, no code
Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.
- 01
Connect your apps
Authenticate Klaviyo and Microsoft 365 with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Klaviyo
connected
Microsoft 365
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Klaviyo and Microsoft 365 objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.
objects · Klaviyo ⇄ Microsoft 365Customers 12,480Sales Orders 8,213Invoices 5,902Items 1,344 - 03
Map fields
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Klaviyo Microsoft 365Company company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Klaviyo and Microsoft 365 integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Klaviyo and Microsoft 365: authenticate both systems, choose the objects to sync (such as Klaviyo's Metrics and Campaigns), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Klaviyo: REST API compliant with the JSON:API specification. Authentication: OAuth 2.0 for apps or private API keys. Microsoft 365: REST API (Microsoft Graph). Authentication: OAuth 2.0 via Microsoft Entra ID, with delegated or application permissions. Stacksync manages authentication, retries, and rate limits on both sides.
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Klaviyo: Klaviyo's current APIs follow the JSON:API specification, so payloads use typed resource objects with relationships rather than flat JSON. Microsoft 365: Change notifications can push events for resources such as messages, events, and driveItems, with subscriptions that must be periodically renewed. Stacksync's field mapping accounts for these differences between Klaviyo and Microsoft 365 without custom code.
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Stacksync is SOC 2 Type II and ISO 27001 certified with HIPAA BAA support. Data is encrypted in transit, and a zero-persistent-storage architecture means Klaviyo and Microsoft 365 records are not retained after a sync operation.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed Klaviyo and Microsoft 365 connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Klaviyo–Microsoft 365 integration in-house.
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Yes — Stacksync ships production-grade connectors for both Klaviyo and Microsoft 365. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
SECURITY
Security teams love Stacksync
As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.
SOC 2 type II
ISO 27001
HIPAA BAA
GDPR
CCPA
CSA STAR
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS
SSO & SCIM
Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.
Alerts
Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.
Secure connection options
Securely connects to your systems with:
Related integrations
Every pair below is a real-time, two-way sync. Search all 386 integrations available for Klaviyo and Microsoft 365.
Popular · 8 of 386
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Klaviyo ⇄ Aviato -
Klaviyo ⇄ Customer.io -
Klaviyo ⇄ eClinicalWorks -
Klaviyo ⇄ Full Enrich -
Microsoft 365 ⇄ Orderful -
Microsoft 365 ⇄ Resend - Microsoft 365 ⇄ ServiceNow
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Microsoft 365 ⇄ Slack
No integrations match .
