Real-time
Two-way sync
Changes in Gmail or Microsoft 365 instantly reflect in both systems. No stale data, no manual imports.
Communications ⇄ Business productivity
Gmail to Microsoft 365 integration — real-time, two-way sync
Keep Gmail 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 Gmail and Microsoft 365
Sync the people, users, and work records in Microsoft 365 with the calls, messages, and events in Gmail, in real time and in both directions.
Microsoft 365 holds the records a team works from: the contacts, the tickets or tasks, the users, and the history attached to each. Gmail moves the actual communication, whether that is a call, a text, an email, or a meeting, and every one of those is tied to a person and often to a user on your side. When the two are connected only by manual entry or a nightly export, the communication happens in one system while the record it belongs to sits in another, so people rebuild context by hand and reach out from contact lists that are already out of date.
Stacksync syncs Mail Messages, Calendar Events, Contacts, OneDrive Files (driveItems) in Microsoft 365 with Drafts, Attachments, History, Messages in Gmail bi-directionally and in real time. Contacts and users maintained in Microsoft 365 feed Gmail so outbound dialing, messaging, and invites reach current numbers and addresses, and the calls, messages, and meeting events Gmail produces attach to the matching record in Microsoft 365 within seconds. Everything is mapped field by field, with conflict resolution in place of copy-paste, and there is no middleware to build, no rate limits to babysit, and no batch job that leaves the morning running on yesterday's data.
Because the sync is field-level, each system keeps its own extras; only the shared people, users, and activity are held in agreement.
Common use cases
- 01 Archive mail and file metadata into a warehouse for compliance and activity analytics.
- 02 Keep CRM contacts and Microsoft 365 contacts aligned in both directions.
- 03 Mirror Labels with pipeline or ticket states so triage done in an external tool is reflected inside the inbox.
- 04 Log sent and received Messages onto CRM contact and deal timelines automatically so reps never copy-paste email history.
Common sync patterns
One contact master
A person's number, email, or contact preferences corrected in either system update the other, so the record and the channel that reaches them stay in agreement.
Where Gmail places calls or sends messages: activity on the record
Calls, texts, emails, or meeting events from Gmail attach to the matching contact, ticket, or item in Microsoft 365, so the full history lives with the record instead of in a separate log.
One user and agent roster
Users kept in Microsoft 365 map to accounts, seats, or extensions in Gmail, so the same people exist on both sides and ownership stays meaningful across the two systems.
What you can sync between Gmail 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.
| Gmail objects | Microsoft 365 objects | How this pairing syncs | |
|---|---|---|---|
| Drafts Unsent messages; created and updated from templates or sequence tools so reps review before sending from their own mailbox. | Contacts Personal and org contacts kept consistent with CRM contact records. | Drafts is specific to Gmail and Contacts to Microsoft 365 — each maps to any object or custom field on the other side. | |
| Attachments File payloads referenced by message part; read out to storage or a document system for archival and compliance workflows. | OneDrive Files (driveItems) File and folder metadata synced for document workflows and audits. | Attachments is specific to Gmail and OneDrive Files (driveItems) to Microsoft 365 — each maps to any object or custom field on the other side. | |
| History The incremental change log keyed by historyId; used for efficient delta sync so only mailbox changes since the last cursor are fetched. | SharePoint Sites & Lists List items read and written like lightweight database tables. | History is specific to Gmail and SharePoint Sites & Lists to Microsoft 365 — each maps to any object or custom field on the other side. | |
| Messages Individual emails with headers, body, and label state; read out to a CRM or warehouse for activity logging, and sent or modified two-way from sales tools. | Teams Team and membership data provisioned from upstream systems. | Messages is specific to Gmail and Teams to Microsoft 365 — each maps to any object or custom field on the other side. | |
| Threads Conversation groupings that keep replies together; synced so a CRM timeline or support desk shows the full exchange, not isolated messages. | Planner & To Do Tasks Task items synced with project and work-management tools. | Threads is specific to Gmail and Planner & To Do Tasks to Microsoft 365 — each maps to any object or custom field on the other side. | |
| Labels User and system labels (INBOX, SENT, custom); applied and removed via sync to mirror pipeline stages or triage states from an external system. | Users Entra ID user accounts synced with HR and identity systems. | Labels is specific to Gmail and Users to Microsoft 365 — each maps to any object or custom field on the other side. |
How changes propagate between Gmail and Microsoft 365
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.
Gmail Microsoft 365 Sub-second propagation
DetectionGmail notifies Stacksync of record changes through webhook events. Incremental sync via users.history.list from a stored historyId cursor, plus real-time push notifications through Google Cloud Pub/Sub watch on the.
DeliveryEach detected change is written to Microsoft 365 through its API, with automatic retries and rate-limit backoff.
Microsoft 365 Gmail Sub-second propagation
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 Gmail through its API, with automatic retries and rate-limit backoff.
Rate-limit considerations
- Gmail: Quota is measured in units per user per second (e.g. messages.list = 5 units, messages.send = 100 units) against a 250 quota-unit/user/second limit and a daily project cap; exceeding limits returns 429 with exponential backoff expected.
What ships with Gmail ⇄ Microsoft 365
Connect Gmail and Microsoft 365 for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Gmail–Microsoft 365 connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Gmail 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 Gmail or Microsoft 365 record.
Observability
Monitoring
Track your Gmail ⇄ 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 Gmail and Microsoft 365.
How the Gmail and Microsoft 365 connectors work
Gmail
- Integration surface
- Gmail API (REST, v1)
- Authentication
- OAuth 2.0 via Google — user-authorized consent with granular scopes (gmail.readonly, gmail.modify, gmail.send, gmail.labels); restricted scopes require Google's app verification for production use
- Change detection
- Incremental sync via users.history.list from a stored historyId cursor, plus real-time push notifications through Google Cloud Pub/Sub watch on the mailbox (watch must be renewed at least every 7 days)
- Capabilities
- read · write · webhooks
- Rate limits
- Quota is measured in units per user per second (e.g. messages.list = 5 units, messages.send = 100 units) against a 250 quota-unit/user/second limit and a daily project cap; exceeding limits returns 429 with exponential backoff expected.
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 Gmail 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 Gmail 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.
Gmail
connected
Microsoft 365
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Gmail 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 · Gmail ⇄ 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.
Gmail Microsoft 365Company company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Gmail and Microsoft 365 integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Gmail and Microsoft 365: authenticate both systems, choose the objects to sync (such as Gmail's Drafts and Attachments), map fields visually, and changes propagate both ways in milliseconds — no code required.
-
Microsoft 365: Delta queries return only resources changed since the last sync token, which keeps incremental syncs cheap on large tenants. Gmail: Restricted Gmail scopes (reading message content) require passing Google's OAuth app verification and, for some app types, an annual third-party security assessment. Stacksync's field mapping accounts for these differences between Gmail and Microsoft 365 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 Gmail and Microsoft 365 records are not retained after a sync operation.
-
Stacksync pricing is usage-based and starts at $1,000/month, including the managed Gmail and Microsoft 365 connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Gmail–Microsoft 365 integration in-house.
-
Yes — Stacksync ships production-grade connectors for both Gmail and Microsoft 365. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
-
Change detection on Gmail: Incremental sync via users.history.list from a stored historyId cursor, plus real-time push notifications through Google Cloud Pub/Sub watch on the mailbox (watch must be renewed at least every 7 days). On Microsoft 365: Graph change notifications (webhooks) plus delta queries for incremental sync. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
SECURITY
Security teams trust 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
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 306 integrations available for Gmail and Microsoft 365.
Popular · 4 of 306
No integrations match .
