M365 Administrator (Exchange)

Ontario Power Generation Inc.; Oshawa; On-site; CAD 90,000 - 120,000; Full time

Job summary

Ontario Power Generation (OPG) is seeking a M365 Administrator (Exchange) to ensure the reliability, security, and efficiency of our Microsoft 365 environment with a focus on Exchange. Reporting to the Section Head, Microsoft Apps Services, you will manage mail flow, hybrid configurations, and PowerShell automation while supporting Teams, SharePoint and OneDrive.

The role requires a 4-year university degree and 6+ years of Exchange administration experience, plus strong problem-solving,

Qualifications

• 4-year University degree in Computer Science, Software Engineering or IT related field.
• Requires over 6 years of experience as an Exchange Administrator.
• Knowledge of email security, compliance, and hybrid Exchange configurations.
• Proficiency with PowerShell scripting for Exchange and M365 automation.
• Excellent troubleshooting, communication, and documentation skills.
• Ability to work collaboratively with other M365 administrators.
• Relevant Microsoft certifications related to M365 are highly desirable.
• Ability to define IT requirements and design/implement systems and services.

Responsibilities

• Oversee Exchange Online mailbox management, distribution groups, shared mailboxes, mail flow rules, retention policies, and hybrid configurations.
• Manage accounts and permissions in Microsoft 365, Exchange admin centers, and Azure AD.
• Develop and maintain PowerShell scripts for automation of Exchange and M365 tasks.
• Provide expert-level support for Exchange issues and guidance to users and management.
• Manage other M365 services (Teams, SharePoint, OneDrive) and collaborate with administrators.
• Implement and monitor security measures for Exchange (anti-phishing, DLP, MFA).
• Create documentation for Exchange and M365 administration processes.
• Stay up to date with new M365 features and best practices.

Skills

PowerShell scripting

Exchange Online

M365 administration

Hybrid configurations

Education

4-year University degree in Computer Science / related IT field

Tools

Microsoft 365 Admin Center

Azure Active Directory

Job description

Job Title: M365 Administrator (Exchange)

Posting Start Date: 16/09/2026

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.

Shift: Days

Travel Required: 10%

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

Electrify your career and help build a brighter tomorrow.

Every generation has a challenge that defines them. At OPG, we are calling on all innovators, disruptors, thought leaders and change-makers. Join us as we work to electrify life in one generation and build a sustainable future powered by our electricity, our ideas, and our people. Join OPG and make history.

Whether you work in the skilled trades or are a business professional, a career at OPG is an opportunity to electrify your life on -- and off -- the job.

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, OneDrive, 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 PowerShell 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, OneDrive, 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 PowerShell 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 PowerShell 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 Administrator Expert MS-102) are highly desirable.
• Requires experience to be able to define users' information technology requirements for all but the most complex problems, and to design, develop, acquire, and implement the required systems, databases, and information technology products and related services.
• Requires experience to understand new and existing information processing concepts, computer and communications equipment, and software.
• Requires a knowledge of the principles of computing equipment, methods, systems analysis and design, data management, work simplification, communications, and computer programming to enable creative logical reasoning regarding the design and effective use of systems and databases, computer programming activities, and related matters.
• Requires a knowledge of computer science to gain an appreciation of design concepts related to computing equipment and software, in order to provide computerized solutions to varying OPG requirements.

The successful candidate willexhibituncompromising integrity and commitment to upholding corporate values, and the OPG Code of Business Conduct.

OPG is committed to fostering an inclusive, equitable, and accessible environment. If you require accommodation during the selection process, please contact [e-mail] .

What makes a career at OPG different?

With operations across Ontario, OPG is one of the most diverse power producers in North America. As the largest generator in Ontario, we meet approximately 50% of the province’s electricity needs,largely fromlow-carbon sources like nuclear and hydro.

As we work to achieve our vision of Electrifying life in one generation, OPG and our family of companies are also helping advance the development of new low-carbon technologies such as Small Modular Reactors (SMRs), refurbishment projects, and electrification initiatives to help power the growing demands of a growing economy. Join OPG and make history.

The Darlington New Nuclear Project is leading the way in the advancement of Small Modular Reactor (SMR) technology in Canada – the future of nuclear power generation! Using new and innovative technologies such as small modular reactors, hydrogen and battery storage, while expanding our hydroelectric and nuclear portfolios, we are changing the electricity landscape in Ontario.

The base salary range considers many factors including, but not limited to experience, education, and training, including any collective agreement requirements for union represented positions. It is not typical for the salary to be offered near the top of the range, and salary is dependent on numerous factors. For management roles, the base salary range does not represent the total compensation package. The total compensation package for regular full-time management roles includes pay-for-performance programs for annual and medium time periods. Maintaining a high-performance culture and excellence is a core expectation of every member of our leadership team and is rewarded through the established compensation framework.

OPG is committed to employment equity. As such, we encourage applicants from equity-seeking communities (Indigenous Peoples, racialized persons, persons with disabilities, and women). We strongly believe that alleviating the under-representation of equity-seeking individuals will create a stronger OPG team and allow us to better serve the needs of our diverse communities.

In order to fulfill the above-mentioned purpose, priority in hiring may be given to qualified persons who self-identify as a member of equity-seeking groups as identified in the application process. This initiative constitutes a special program under the Human Rights Code/Canadian Human Rights Act.

All job postings at OPG are to fill existing vacancies within our organization.

OPG may use artificial intelligence (AI) tools as part of the applicant screening process. However, applications will also be reviewed by a member of our Recruitment team to ensure a fair and thorough assessment.