EWS Replacement

Replace legacy EWS contact sync with Microsoft Graph

If your organization still relies on EWS-based scripts, this is the clean migration path: move to CYNC, run Graph-first sync, and remove brittle script maintenance from your operations.

Why teams move off EWS scripts

Protocol risk

EWS deprecation increases long-term maintenance and outage risk for script-based sync.

Operational overhead

PowerShell jobs need ongoing patching, monitoring, and custom retry logic.

Limited visibility

Troubleshooting typically depends on raw logs instead of a managed dashboard.

Migration checklist

1

Prepare Graph access

Create an Entra ID App Registration, upload a certificate, and grant the required Microsoft Graph Application permissions.

Open Entra ID setup guide
2

Deploy CYNC

Install the service and admin UI on a Windows Server 2019+ host, then connect the dashboard to your tenant configuration.

Download installer
3

Validate with a pilot

Start with a controlled mailbox group, run manual sync, verify contact cards and phone caller ID behavior before broader rollout.

Read getting started
4

Cut over from scripts

Disable legacy EWS jobs after validation and keep one source of truth in CYNC to avoid duplicate writes or drift.

Use migration checklist

EWS replacement FAQ

Why replace EWS contact sync now?

Microsoft is retiring Exchange Web Services for many scenarios. Graph-based sync avoids protocol debt and keeps your contact sync strategy aligned with Microsoft 365 direction.

Can I migrate without interrupting users?

Yes. You can run a staged migration: pilot target users first, validate sync results, then roll out to all mailboxes. CYNC keeps sync runs isolated and auditable.

Do I need PowerShell skills to operate CYNC?

No. CYNC is configured through a WinUI admin dashboard and runs as a Windows Service. No custom script maintenance is required for normal operations.

What permissions are required?

Application permissions User.Read.All, Group.Read.All, and Contacts.ReadWrite in Microsoft Graph, all with admin consent.

Ready to cut over from legacy scripts?

Start with CYNC's free tier and validate migration with a pilot group.

Download CYNCView pricing