Two-way sync
Changes in Microsoft 365 or Microsoft Graph instantly reflect in both systems. No stale data, no manual imports.
Keep Microsoft 365 and Microsoft Graph in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
Microsoft 365 is where customer-facing and operational work happens: the tickets, conversations, contacts, and records a team touches every day. Microsoft Graph is where engineering runs the systems behind that work — the issue trackers, message brokers, directories, and monitors that keep services moving. The same items, people, and events matter to both, and when the only link between them is a manual hand-off or an overnight export, each side acts on a stale copy of what the other already knows.
Stacksync syncs Contacts, OneDrive Files (driveItems), SharePoint Sites & Lists, Teams in Microsoft 365 with Drive items (OneDrive & SharePoint), Teams messages and chats, Planner tasks, Users in Microsoft Graph field by field, in real time, and in both directions. You decide which system owns which fields; Stacksync maps the overlap, resolves conflicts by rules you set, and keeps every copy current, with no middleware to build and no API limits to babysit.
Open items, throughput, and error counts from Microsoft 365 replicate into Microsoft Graph, so the operational view reflects what is actually happening in the business.
Where both systems keep records for the same contacts, items, or users, a correction in either updates the other, ending dual maintenance and keeping IDs aligned for every other flow.
A ticket or request raised in Microsoft 365 opens or updates a matching issue in Microsoft Graph, and status, comments, and resolution flow back, so support and engineering work the same item instead of retyping it.
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.
| Microsoft 365 objects | Microsoft Graph objects | How this pairing syncs | |
|---|---|---|---|
| Users Entra ID user accounts synced with HR and identity systems. | Users Entra ID user accounts read and written via /users; create, update profile attributes, and enable or disable accounts with User.ReadWrite.All. | Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions. | |
| Calendar Events Events synced with scheduling tools and CRMs for meeting visibility. | Calendar events Outlook events via /users/{id}/events; read and write meetings, attendees, and recurrence, and accept or decline invitations. | Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions. | |
| Contacts Personal and org contacts kept consistent with CRM contact records. | Contacts Personal Outlook contacts via /users/{id}/contacts; full create, read, update, delete, synced two-way with CRM person records. | Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions. | |
| Mail Messages Exchange Online messages read for logging, archiving, or activity capture. | Planner tasks Plans, buckets, and tasks via /planner; read and write task status, assignments, and due dates to keep project state in sync. | Mail Messages is specific to Microsoft 365 and Planner tasks to Microsoft Graph — each maps to any object or custom field on the other side. | |
| OneDrive Files (driveItems) File and folder metadata synced for document workflows and audits. | Groups and memberships Microsoft 365 and security groups via /groups; read and write name, owners, and add/remove members, with membership deltas surfaced by delta query. | OneDrive Files (driveItems) is specific to Microsoft 365 and Groups and memberships to Microsoft Graph — each maps to any object or custom field on the other side. | |
| SharePoint Sites & Lists List items read and written like lightweight database tables. | Mail messages (Outlook) Messages via /users/{id}/messages; read and create drafts, update, and send with the sendMail action, so this surface is fully read-write. | SharePoint Sites & Lists is specific to Microsoft 365 and Mail messages (Outlook) to Microsoft Graph — each maps to any object or custom field on the other side. |
Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.
DetectionMicrosoft 365 notifies Stacksync of record changes through webhook events. Graph change notifications (webhooks) plus delta queries for incremental sync.
DeliveryEach detected change is written to Microsoft Graph through its API, with automatic retries and rate-limit backoff.
DetectionMicrosoft Graph notifies Stacksync of record changes through webhook events. Delta query (change tracking) returns created, updated, and deleted items since the last deltaLink for users, groups, mail, events, contacts, and.
DeliveryEach detected change is written to Microsoft 365 through its API, with automatic retries and rate-limit backoff.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Microsoft 365–Microsoft Graph connection.
Changes in Microsoft 365 or Microsoft Graph instantly reflect in both systems. No stale data, no manual imports.
Trigger automated workflows whenever Microsoft 365 or Microsoft Graph data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.
Handle millions of events per minute without losing a single Microsoft 365 or Microsoft Graph record.
Track your Microsoft 365 ⇄ Microsoft Graph sync health, view errors, and replay failed events in one click.
Transform legacy EDI complexity into simple database interactions between Microsoft 365 and Microsoft Graph.
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.
Authenticate Microsoft 365 and Microsoft Graph with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Pick the Microsoft 365 and Microsoft Graph 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.
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Yes. Stacksync provides a managed, real-time two-way integration between Microsoft 365 and Microsoft Graph: authenticate both systems, choose the objects to sync (such as Microsoft 365's Users and Calendar Events), map fields visually, and changes propagate both ways in milliseconds — no code required.
Yes. Each object mapping can be bidirectional or restricted to a single direction (both systems accept writes). Read-only mirrors, one-way pushes, and full two-way sync can be mixed in the same integration.
Common patterns for Microsoft 365 and Microsoft Graph: Where Microsoft Graph watches operations: live volumes for visibility; One shared record across both systems; Where Microsoft Graph tracks engineering work: requests become issues. Open items, throughput, and error counts from Microsoft 365 replicate into Microsoft Graph, so the operational view reflects what is actually happening in the business.
Microsoft 365: REST API (Microsoft Graph). Authentication: OAuth 2.0 via Microsoft Entra ID, with delegated or application permissions. Microsoft Graph: Microsoft Graph unified REST API (v1.0 and beta) at graph.microsoft.com, spanning Microsoft 365 services — Entra ID, Outlook mail and calendar, OneDrive and SharePoint, Teams, and Planner; supports JSON $batch (up to 20 requests per call). Authentication: OAuth 2.0 via the Microsoft identity platform (Microsoft Entra ID). An app registration holds delegated or application (app-only) scopes such as Mail.ReadWrite, Calendars.ReadWrite, Files.ReadWrite.All, User.ReadWrite.All, and Group.ReadWrite.All; application permissions require tenant admin consent. Stacksync manages authentication, retries, and rate limits on both sides.
Microsoft 365: Change notifications can push events for resources such as messages, events, and driveItems, with subscriptions that must be periodically renewed. Microsoft Graph: Delta query provides incremental change tracking (created, updated, and deleted since the last deltaLink) for users, groups, messages, events, contacts, and driveItems, but delta tokens expire — about 7 days for directory objects — and then require a full re-read. Stacksync's field mapping accounts for these differences between Microsoft 365 and Microsoft Graph without custom code.
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 Microsoft 365 and Microsoft Graph records are not retained after a sync operation.
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.
Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.
Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.
Securely connects to your systems with:
Every pair below is a real-time, two-way sync. Search all 267 integrations available for Microsoft 365 and Microsoft Graph.