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Microsoft 365 contact sync, Entra ID, and Graph API

Practical, field-tested guides for IT admins. No fluff, no marketing speak — just the mechanics of getting the Global Address List onto people’s phones.

Entra IDBest practicesSecurityApril 20, 2026 · 7 min read

Entra ID contact sync best practices: the 10 rules every admin should follow

A decade of field-tested lessons on syncing Entra ID (Azure AD) users to Exchange Online contacts. Certificate auth, delta queries, folder strategy, GDPR, photo sync, and the mistakes that make contacts drift out of date.

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MSPMulti-tenantRMMApril 19, 2026 · 5 min read

GAL sync for MSPs: managing contact sync across multiple Microsoft 365 tenants

MSPs running contact sync across dozens of tenants face unique problems: per-tenant app registrations, centralized billing, RMM deployment, and Server Core headless operation. The pattern that actually scales.

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Microsoft Graph APIThrottlingPerformanceApril 18, 2026 · 6 min read

Microsoft Graph API throttling for contact sync: what IT admins need to know

How Graph API throttling actually works for /users and /contacts endpoints, why naive sync loops fail at 500+ mailboxes, and the four patterns (batching, delta, backoff, concurrency) that keep you under the limits.

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CiraSync alternativeContact syncData residencyApril 15, 2026 · 6 min read

Looking for a CiraSync alternative? The self-hosted options compared (2026)

CiraSync works, but $5/user/month and third-party cloud data-residency are dealbreakers for many. The three realistic alternatives — self-hosted Graph sync, EWS scripts, and sync.blue — compared head-to-head.

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EWS deprecationMicrosoft Graph APIMigrationApril 10, 2026 · 7 min read

EWS is turning off in October 2026 — what contact-sync admins need to do right now

Microsoft is retiring Exchange Web Services for Exchange Online on October 1, 2026. A practical migration checklist for IT admins still running EWS-based PowerShell contact-sync scripts.

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GAL syncMicrosoft 365Mobile contactsApril 1, 2026 · 8 min read

How to sync the Global Address List (GAL) to mobile phones in Microsoft 365

Why the Microsoft 365 GAL doesn't show up as contacts on iPhone or Android by default — and the 4 supported ways to fix it, ranked by cost, effort, and reliability.

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