CiraSync On-Prem: Secure, Automated Contact & Calendar Sync for Air‑Gapped and High‑Security Environments

CiraSync On‑Prem is the fully isolated, firewall‑protected version of CiraSync designed for agencies and enterprises that cannot allow any cloud connectivity. Built for classified networks, government agencies, defense contractors, utilities, and critical infrastructure, CiraSync On‑Prem delivers the same powerful contact and calendar automation as CiraSync Cloud, without sending a single packet outside your environment.

If your organization requires absolute data sovereignty, zero external dependencies, and complete administrative control, CiraSync On‑Prem is the synchronization engine built for you.

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Trusted by 3,000+ Enterprises Worldwide

Purpose‑Built for High‑Security and Air‑Gapped Networks

Your IT team maintains full control over deployment, authentication, and update cycles. CiraSync On‑Prem integrates directly with Microsoft 365, Exchange Server, and Active Directory, ensuring secure, automated sync across all employee smartphones—without compromising compliance.

CiraSync On‑Prem runs entirely inside your infrastructure:
No cloud services
No external APIs
No outbound connections
No data leaving your network

Key Capabilities

1. One‑Way Sync to Every User’s Smartphone

Push accurate, up‑to‑date information to Outlook and mobile devices:

  • Global Address List (GAL)
  • Shared mailboxes
  • Public folders
  • Distribution lists
  • Shared calendars
  • Resource calendars
  • Every user receives the latest data automatically.

No manual updates, no user training, no risk of outdated contacts.

2. Full Control Behind Your Firewall

CiraSync On‑Prem installs as a virtual machine inside your network, giving you:

  • Complete administrative oversight
  • Customizable sync policies
  • Role‑based access control
  • Local logging and auditing
  • Offline operation with no cloud reliance
3. Designed for Regulated and Classified Environments

Ideal for organizations with strict compliance requirements:

  • Government agencies
  • Defense and military networks
  • Utilities and critical infrastructure
  • Airports and transportation
  • Financial institutions
  • Healthcare and emergency services

Contacts Synced

Industries

Companies

Users

How CiraHub Works

CiraHub uses “Hubs” to connect multiple contact sources. Each Hub can sync two or more sources simultaneously, ensuring every system stays updated in real time.

Example Use Cases

  • Sync Salesforce contacts with Microsoft 365 and push them to employee phones
  • Maintain a unified GAL across multiple tenants after mergers or acquisitions
  • Keep shared mailbox contacts synced with public folders and mobile devices
  • Create a centralized contact list for field teams, first responders, or service crews
Features & Requirements

CiraSync Cloud vs. CiraSync On‑Prem

Why IT Teams Choose CiraSync On‑Prem

  • Eliminate Manual Updates: Stop relying on spreadsheets, shared drives, or user‑maintained contacts. CiraSync On‑Prem automates everything.
  • Reduce Operational Risk: Ensure every employee has accurate contact and calendar data at all times. From field teams to executives, every contact is accounted for.
  • Strengthen Security Posture: Keep all data inside your network while still delivering modern mobile productivity.
  • Deploy in Hours, Not Weeks: A lightweight virtual appliance that integrates seamlessly with your existing Microsoft environment.
Enterprise Ready

Security You Can Trust

Built for the most demanding enterprise environments. Your data stays protected with industry-leading security practices.

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Bring Secure, Automated Sync to Your High‑Security Environment

CiraSync On‑Prem gives your organization the power of automated contact and calendar synchronization, without ever touching the cloud.

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