How Opensense Works with Microsoft 365

Opensense integrates with Microsoft 365 at the mail transport level, applying email signatures server-side before messages reach the recipient. Unlike client-side plugins or Outlook add-ins that depend on individual installations, Opensense works through Exchange Online transport rules to inject signatures automatically on every outgoing email.

This architecture means full compatibility across every Microsoft email client, including Outlook desktop (Windows and Mac), Outlook Web Access (OWA), Outlook mobile on iOS and Android, and shared or delegated mailboxes. No matter how your team sends email, every message carries a consistent, on-brand signature.

For IT administrators, setup is a one-time configuration. Connect your Microsoft 365 tenant, sync your directory through Azure AD (Entra ID), and deploy transport rules. There are no plugins to push through Intune, no browser extensions to manage, and no end-user training required. Employees send email exactly as they always have, and Opensense handles the signature behind the scenes.

Real-time updates are central to the platform. When marketing launches a new banner campaign or legal requires a disclaimer update, changes are pushed from the Opensense dashboard and applied to every outgoing email within minutes. There is no need to email instructions to employees, update group policies, or wait for users to restart Outlook.

Azure AD and Entra ID integration enables automatic user provisioning and department-based signature rules. New hires receive their signature the moment their account is created. When someone changes teams or titles, their signature updates automatically based on directory attributes. This eliminates manual signature management entirely and ensures accuracy across organizations of any size.

Opensense also supports Exchange on-premise and hybrid environments, making it the right choice whether your organization is fully in the cloud, still running on-premise Exchange servers, or in the middle of a migration. Learn more about email signature management across your entire organization.

Office 365 vs. Exchange On-Premise

Microsoft is actively migrating organizations to Exchange Online and Microsoft 365, and your email signature solution should be ready for that transition. Legacy on-premise signature tools require direct server access, ongoing IT maintenance, and manual updates whenever Exchange is patched or upgraded.

Opensense is built cloud-first. There is no on-premise software to install, no servers to maintain, and no version compatibility issues to troubleshoot. The platform connects to your Microsoft 365 tenant through secure APIs and transport rules, operating entirely in the cloud.

For organizations in the middle of a hybrid migration (running both Exchange on-premise and Exchange Online), Opensense handles both environments simultaneously. Signatures remain consistent whether an employee's mailbox is on-premise or in the cloud, and no reconfiguration is needed as mailboxes are migrated. This makes Opensense the only signature platform that truly future-proofs your investment through every stage of your Microsoft journey.

GCC High & Government Support

Opensense is the only email signature platform that supports Microsoft GCC High environments. This makes it the solution of choice for government contractors, defense organizations, and federal agencies that require FedRAMP-level compliance for their email infrastructure.

GCC High environments have strict data residency and security requirements that standard SaaS tools cannot meet. Opensense was purpose-built to operate within these boundaries, with U.S.-based data residency and SOC 2 Type II certification. Signatures, banner images, and analytics data all remain within compliant infrastructure.

For organizations that handle Controlled Unclassified Information (CUI), International Traffic in Arms Regulations (ITAR) data, or other sensitive government communications, Opensense delivers the same powerful signature management capabilities available to commercial customers, without compromising on compliance requirements.

Visit GCC High email signatures for a detailed overview of capabilities and compliance certifications.

IT Admin Benefits

The Opensense dashboard gives IT administrators centralized control over every email signature in the organization, without touching individual mailboxes or relying on end users to follow instructions.

The built-in template designer uses a drag-and-drop interface, so creating and updating signatures requires no HTML knowledge. Marketing teams can design branded templates, and IT simply assigns them to the appropriate groups.

Department-specific signature rules are powered by Azure AD groups. Sales teams can display different banners than engineering. Legal can have a unique disclaimer. Regional offices can show localized contact information. All of this is managed through rules in the dashboard, not manual configuration.

Scheduled signature changes let you plan ahead. Launch a campaign banner on a specific date, rotate seasonal promotions automatically, or update legal disclaimers before a compliance deadline, all without last-minute scrambles.

Detailed audit logging tracks every change made to templates, rules, and assignments. For regulated industries, this provides the documentation trail needed for compliance reviews and internal audits. The result: zero helpdesk tickets for signature updates, and IT teams that spend their time on higher-value work.

Migrating from Transport Rules to Opensense

If your organization currently manages email signatures using native Microsoft 365 transport rules, migrating to Opensense is straightforward and typically takes less than two hours.

Step 1: Connect Your Microsoft 365 Tenant (15 minutes)

Authorize the Opensense application in your Microsoft 365 admin center and configure the mail flow connector. Your existing transport rules continue operating during this step, so there is no disruption to email signatures.

Step 2: Recreate Signature Templates (30-60 minutes)

Build your signature designs in the Opensense drag-and-drop editor. Most organizations use this as an opportunity to standardize and refresh their signature designs. The Opensense design team will create up to five custom templates at no additional cost. Import employee data from Azure AD to populate name, title, department, and contact fields automatically.

Step 3: Switch Mail Flow (5 minutes)

Once templates and rules are configured in Opensense, disable your existing transport rules and activate the Opensense mail flow connector. The switch is immediate: the next outgoing email carries the Opensense-managed signature. Verify a few test emails, then remove the old transport rules.

Total migration time: under 2 hours for most organizations.

How Opensense Compares to Other Office 365 Signature Solutions

For detailed comparisons, see Opensense vs. CodeTwo and Opensense vs. Exclaimer.

Frequently Asked Questions

Do users need to install anything?

No. Opensense deploys server-side through Microsoft 365 transport rules. End users do not install plugins, add-ins, or browser extensions. They send email exactly as they normally do, and signatures are applied automatically before the message is delivered. This eliminates user adoption challenges and helpdesk requests.

Does it work with shared mailboxes?

Yes. Because signatures are applied at the mail transport level, shared mailboxes, distribution lists, and delegated send-on-behalf scenarios are all fully supported. The correct signature is applied based on the sender and the rules configured in the Opensense dashboard.

What about mobile Outlook?

Opensense provides full support for Outlook on iOS and Android. Since signature injection happens server-side, mobile users receive the same branded, up-to-date signatures as desktop users, with no mobile app configuration required.

Can different departments have different signatures?

Yes. Opensense uses Azure AD group-based rules to assign different signature templates, banners, and disclaimers to different departments, teams, or regions. You can create as many variations as needed, and assignments update automatically when users move between groups.

How long does setup take?

Most organizations are fully deployed and live within 15 minutes. The process involves connecting your Microsoft 365 tenant, syncing your Azure AD directory, and configuring transport rules. Opensense provides guided setup and dedicated support to ensure a smooth deployment. Book a demo to see how quickly you can get started with the Office 365 integration.

Learn More

• How to Add a Signature in Outlook 365 - Step-by-step for desktop, web, and mobile
• How to Set Up Email Signatures in Office 365 - Compare every method available
• Organization-Wide Email Signatures in Microsoft 365 - Transport rules, PowerShell, and third-party tools
• IT Admin's Complete Guide to Office 365 Email Signature Management - Evaluate native tools vs. third-party solutions
• Email Signature Compliance for Microsoft 365 - Legal requirements and enforcement strategies
• Free Office 365 Email Signature Templates - Copy-paste ready templates for Outlook
• Why Outlook Plugins Fail for Email Signatures - The case for server-side deployment
• Email Signature Management: The Complete Guide - Centralize and automate across your organization
• Pricing - View Opensense pricing for Microsoft 365 organizations