M365 Administrator; Exchange

Posting End Date: 30/09/2026

Status: Regular

Number of Openings: 1

Education Level: 4-Year University degree in Computer Science, Software Engineering or something related to information technology.

Base Location: 1908 Colonel Sam Drive, Oshawa, Ontario L1H 8W8

Shift: Days

Travel Required: 10%

Salary Range: $1,664.34 - $2,622.59

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Ontario Power Generation (OPG) is looking for a dynamic, strategic and results-driven professional to join our team in the role of M365 Administrator (Exchange).

Job Overview

Ontario Power Generation (OPG) is looking for a dynamic, strategic and results-driven professional to join our team in the role of M365 Administrator (Exchange).

Reporting to the Section Head, Microsoft Apps Services, this position is responsible for ensuring the reliability, security, and efficiency of OPG’s Microsoft 365 environment, with a primary focus on Exchange Administration. This includes managing and optimizing email services, maintaining high availability, and supporting secure communications across the enterprise. In addition to Exchange, this Administrator will also manage other M365-related services (including Teams, SharePoint, One Drive, Copilot and Power Platform) working collaboratively with team members to ensure seamless operations and business continuity.

Key Accountabilities

• Oversee all aspects of Exchange Online, including mailbox management, distribution groups, shared mailboxes, mail flow rules, retention policies, spam and malware filtering, and hybrid configurations.
• Manage accounts and permissions within the Microsoft 365 and Exchange admin centers, and Azure Active Directory, ensuring compliance with organizational policies.
• In-depth knowledge of Exchange Server versions, including installation, configuration, and troubleshooting.
• Develop and maintain Power Shell scripts for automation of Exchange and M365 administrative tasks, improving efficiency and consistency.
• Provide expert-level support for Exchange issues.
• Assist, and provide guidance to users and line management, both within and outside of the division.
• Manage other M365 services (Teams, SharePoint, One Drive, etc.), assisting end-users and collaborating with other administrators as needed.
• Implement and monitor security measures for Exchange, including anti-phishing, DLP, eDiscovery, retention policies, and multi-factor authentication.
• Support organizational compliance initiatives across all M365 services.
• Utilize Microsoft 365 admin tools and Power Shell scripts to monitor system health, execute purges, generate usage and performance reports, and proactively address potential issues or updates which may impact the tenant.
• Monitor the effectiveness and efficiency of use of products, systems, or databases in production, and recommend corrective actions.
• Resolve emergency problems under time constraints, identify latent (underlying or recurring) problems, and implement changes or workarounds to eliminate or mitigate their impact.
• Complete root cause analysis for major incidents and prepare detailed written reports documenting findings and corrective actions.
• Stay up to date with the latest M365 features and best practices.
• Create and maintain comprehensive documentation for Exchange and M365 administration and related processes.
• Advise and assist users concerning the production use of systems and products.
• Implement and document enhancements and changes to meet new user needs.

Qualifications

• 4-year University degree in Computer Science, Software Engineering or something related to information technology
• Requires over 6 years of experience as an Exchange Administrator.
• Knowledge of email security, compliance, and hybrid Exchange configurations.
• Proficiency with Power Shell scripting for Exchange and M365 automation.
• Excellent troubleshooting, communication, and documentation skills.
• Ability to work collaboratively with other M365 administrators
• Relevant Microsoft certifications (e.g., Microsoft 365 Certifications, Administrator Associate, or other relevant to…