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Senior Microsoft Exchange

Houston, TX
February 01, 2023

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Ositolu Muyiwa Osibowale

Senior Microsoft Exchange/Office 365 Engineer 281-***-****

Professional Summary

Overall IT experience spans 11+ years.

Exchange/Office 365/Cloud experience spans 8+ years..

Highly qualified Microsoft Exchange and Office 365 professional with hands-on professional work experience including roles such as Cloud Engineer, Microsoft 365 Engineer, Office 365 Administrator, Active Directory Administrator, and Systems Administrator.

Specialist in Microsoft Exchange, Office 365, Skype-for-Business, Active Directory, and PowerShell.

Experience with Cloud technologies, Azure Cloud and Microsoft 365 Enterprise Solutions and Workloads.

Deploy and implement different roles in the Microsoft Exchange environment: Edge transport, Mailbox, CAS array, Hub transport and unified messaging.

Plan size and capacity for Exchange by analyzing Exchange statistic reports before beginning migration process.

Deploy Active Directory environments, including file shares, CA, AD and DNS zones.

Administer mid- to Large-scale Exchange production environments where e-mail and messaging services are mission critical.

Install, configure, and maintain Active Directory and third-party migration products.

Write PowerShell scripts to efficiently fix errors found through Active Directory, Exchange, and Office 365.

Apply in-depth knowledge of Active Directory and LDAP technologies on Windows.

Install, configure, and optimize IT infrastructures to achieve high availability and performance.

Deploy Office 365 Infrastructures with ADFS Farm and ADFS Proxy servers.

Resolve Office 365 tasks with the use of PowerShell.

Configure ADConnect and ADFS for Active Directory synchronization and single sign-on with Office 365 and Azure.

In-depth experience in troubleshooting and resolving client/server issues with backup and recovery solutions for planned disaster recovery.

Experience in ITIL process/Incident Management.

Strong experience in Implementing Active Directory in production environment, including GPO's, DNS, WINS, DHCP, and Domain Controllers etc.

Configure Hybrid Configuration Wizard and connection from Exchange 2013 to Exchange Online tenant.


Microsoft Skills

Active Directory, AD DS, DirSync, Azure ADConnect, ADAM, AD LDS, Active Directory Schema, PowerShell Scripting, Active Directory Administration, Task Automation and Migration mailbox moves with PowerShell,DirSync,Azure ADConnect,Active Directory Schema,Exchange 2003,VMWare/VSphere,VirtualBox, Exchange OnlineHyperV

Exchange Server

Exchange 2003, 2007, 2010, 2013, 2016, 2019, and Exchange Online

Windows Server: Windows Server 2003/R2, and 2008, 2008/R2, Windows Server 2012, 2012/R2, Windows Server 2016, 2019

Linux Server: Unix, Linux, Red Hat, Oracle, Ubuntu

Virtualization: HyperV, VMWare/VSphere, VirtualBox, Virtual Machine

Databases: Microsoft SQL Server, Oracle


Software Packages

Microsoft Visual Studio, Microsoft Office (Word, Excel, PowerPoint)

Exchange Skills

Database Availability Group (DAG) DAC Mode, CAS Array, Hub Transport Server, Continuous Cluster Replication (CCR), Standby Cluster Replication (SCR), Red Hat, Local Copy Replication (LCR), Exchange management console (EMC), Outlook Web App (OWA), Transport pipeline, Managed Availability, Exchange Online Protection (EOP), Microsoft 365 ATP, Antispam, Antimalware, Impersonation Protection, SafeLinks, SafeAttachments, SPF, DMARC, DKIM, Exchange Admin Center (EAC), Outlook Web App (OWA)/Outlook On the Web (OOTW) for 2016

Office 365 Skills

Active Directory Federation Services (ADFS), DirSync, Azure AD Connect, On Prem to Cloud migrations, cross-tenant migrations, PowerShell,AD LDS Automation, Group-base licensing, SharePoint, OneDrive for Business, Microsoft Teams, Intune, EMS, MDM and MAM, Conditional Access policies, Multifactor Authentication.

Work History

04/2022 – Present


British Petroleum, Houston, TX

BP America Inc. produces and retails oil and natural gas.

●Set up Hybrid AD from scratch.

●Set up a single forest and domain.

●Ensured architecture allowed support for low bandwidth sites (i.e., vessels).

●Created new computer accounts and joined to directory services.

●Set appropriate permissions on the created objects and linked them to appropriate GPOs.

●Set up Intune security features and enabled for users to be migrated.

●Mapped out architecture to integrate with current BP. Print. Solution for Azule Energy Users.

●Mapped out architecture for Three. Party integration for Print solution to enable print anywhere for Azule, BP and ENI users.

●Created GPO and linked it in AD.

●Created gMSA Service Account in PowerShell.

●Created Organizational Units (OUs) containers within Microsoft Active Directory domain to hold users, groups and computers.

●Created and ran tests verifying migration pre-flight.

●Configured VM to DC.

●Created knowledge Transfer (KT) documents with simple procedures and troubleshooting guidelines.

●Configures delegations in AD environment.

●Created new users and user mailboxes, distribution groups, and security groups.

●Created CSV file and PowerShell for moves to mailbox databases.

●Prepared runbook for the project.

02/2020 – 04/2022


Goodman Manufacturing, Houston, TX

Goodman Manufacturing is an American company operating as an independent subsidiary of Daikin Group, the world's largest manufacturer of heating, ventilation and air conditioning products and systems.

●Migrated Exchange 2013 on-prem to Office 365 Hybrid.

●Met with stakeholders to gather requirements for new Hybrid communications environment.

●Analyzed current environment that consisted of Windows Server 2012 and Exchange 2013 with Outlook client.

●Identified and reported compromised accounts, failed log ins and authentication requests, and bad tokens.

●Planned new environment after analyzing needs and determining licensing needs, virtual servers and tools needed for migration.

●Set up a safe test environment using Microsoft Hyper-V.

●Configured DirSync (Azure AD Connect) and ADFS for Active Directory synchronization/Federation with Azure Active Directory.

●Created test accounts and completed pilot migration.

●Rolled-out implementation of Exchange Online and Office 365.

●Utilized Hybrid Configuration Wizard (HCW) on Exchange 2013 to establish send and receive connectors with Office 365.

●Created migration batches in the Office 365 Admin Center and used PowerShell to check the status of the migration and get statistics.

●Troubleshot migration errors such as failed mailbox moves, and connectivity errors, etc.

●Assigned Enterprise licenses (E1, E3, and E5) in Office 365 using PowerShell.

●Provided hyper-support to users post migration.

●Created Knowledge Transfer (KT) documentation with simple procedures and troubleshooting guidelines.

●Led “Train the Trainer” training sessions with the help desk team.

●Assisted with Exchange messaging system administration while training technical staff in daily administration and troubleshooting.

●Performed troubleshooting of connectivity issues, calendaring, and Active Directory issues.

●Managed groups, permissions, and shared mailboxes.

●Ensured high availability through DAG Replication for the On Prem environment.

●Created and managed distribution and security groups.

●Designed and planned Skype-for-Business migration to Teams for IM, A/V, and Enterprise Voice services.

07/2018 – 02/2020


Brookdale Senior Living, Brentwood, TN

Brookdale Senior Living owns and operates senior living communities and retirement communities across the United States.

●Migrated from Lync 2013 on-prem to Skype-for-Business Online using a cutover migration to move all users in a single pass.

●Used PowerShell to extract contacts and info and put it into Skype-for-Business.

●Disabled on-premises services and accessed Skype-for-Business Online.

●Prepared a backup/restore plan for the organization.

●Exported a list of all Skype-for-Business enabled users and their contacts.

●Confirmed that on-premises user accounts synchronized with Active Directory in Office 365 using Office 365 Admin Center using a tenant admin account.

●Backed-up user accounts and settings.

●Moved a test group of pilot users to Skype-for-Business online to test environment configuration and verify the features and services function as expected.

●Utilized the Skype-for-Business Server Management Shell in the Microsoft Office 365 tenant and moved all users from on-premises to Skype-for-Business online in one pass.

●Verified successful migration and users in Business Online Control Panel.

●Applied technical troubleshooting to DAG issues, Mail flow and OWA connectivity issues.

●Set up CAS Array and archiving for the users.

●Implemented DAG in DAC mode for cross site DAG configuration and recovery.

●Performed diagnostics of Arrays, Transport Hubs, Mailbox Servers, CAS Servers, Domain Controllers and more.

●Handled technical issues escalated by lower tiers for Exchange related issues to include troubleshooting log errors, connection issues, integration problems and authentication in Internet Information Services (IIS).

●Performed troubleshooting on the systems to ensure optimal performance.

●Handled Identity Management and ADFS (Break/Fix situations).

●Deployed Office Professional Plus (Word, Excel, OneNote, PowerPoint).

●Utilized ActiveSync for configuration of mobile messaging services.

09/2016 – 07/2018


UST Global, Aliso Viejo, CA

UST is a provider of digital technology and transformation, information technology and services.

●Participated in migrating Exchange to Office 365.

●Enabled cloud-based workflows and solutions and moved critical data in the process.

●Investigated and resolved many issues within Active Directory in Exchange system prior to Office 365 migration.

●Installed and updated various software applications.

● Configured Windows 2008 virtual machines for the deployment of Lync 2010 and related services.

●Configured mail flow for hybrid and tested internally, remote, and external mail routing.

●Created new user and shared mailboxes, distribution groups, and security groups.

●Created batches via CSV files and PowerShell for moves to Office 365 for user mailbox databases.

●Maintained clustering configuration for Exchange 2007 server high availability through the clustering manager to monitor and maintain services and configuration.

●Created hybrid scenario by registering domain, federating namespace, and subscribing for corporate licenses.

●Installed Microsoft environment services. I did this while maintaining organizational standards for connectivity between users and cloud.

●Implemented Directory Service Synchronization with DirSync/AzueADConnect using ADFS server for single sign-on functionality.

●Implemented and configured CASArrays for load balanced connectivity to Exchange 2010 for RPC client access

●Created coexistence between Exchange 2007 and Exchange 2010, configured connectors, namespaces,

●Applied hands-on technical troubleshooting to Office 365 applications and resolved issues, mostly relating to setting and configuration conflicts.

●Investigated and performed troubleshooting activities on backend and end-user issues related to connectivity and databases.

●Performed functionality tests on Exchange, Lync, and Microsoft Office 365.

●Managed user accounts and mailboxes in administration portal.

03/2014 – 09/2016


E.ON UK, Coventry, UK

E.ON UK is a British energy company and the largest supplier of energy and renewable electricity in the UK,

●Led effort to verify and decommission Exchange 2007 servers and provided status reports.

●Assisted as part of a team in building and managing lab environments with complex settings, configurations, topologies and equipment, including servers and various network elements.

●Monitored systems health by physically inspecting environments and utilizing tools such as SCOM.

●Looked after day-to-day administration, operation, and support of enterprise messaging infrastructure, including Microsoft Exchange 2010, SMTP Edge Systems, e-mail compliance systems and Blackberry Mobile Technologies.

●Configured, implemented, and troubleshot Outlook.

●Deployed and configured applications on workstations using SCCM.

●Configured ActiveSync profiles for mobile device connectivity to Exchange 2007 and tested with clients to ensure functionality.

●Handled user management, creating and modifying accounts, file systems, network rights and access to file systems and directories.

●Troubleshot failed mailbox migrations, monitored migration statistics, reported to management on progression, and made adjustments to plans as necessary.

●Assisted with client upgrade process and testing effort for Outlook 2010 client for enterprise users in conjunction with Outlook anywhere access.

●Troubleshot issues with mail blockage, spam, OWA access, and slow performance, providing both on site and remote diagnosis and resolution

●Handled requests related to mail quotas, delegation, rights management and individual mail restores.

05/2011 – 03/2014


Imperial Brands plc, Bristol, UK

Imperial Brands plc (formerly Imperial Tobacco Group plc) is a British multinational tobacco company.

●Built, installed, configured Red Hat Linux servers in a data center environment.

●Installed new servers using kick-start installation and other configuration methods.

●Diagnosed and resolve issues associated with DNS, DHCP, and NFS.

●Configured and administered user accounts and passwords on RHEL and CentOS Linux servers.

●Set up permission on files and applications for users and groups.

●Applied automated Scheduling of tasks using Cron jobs.

●Created and ran basic BASH scripts.

●Applied/configured Logical Volume Management (LVM) - adding and partitioning disks using pvcreate, vgcreate and lvcreate to create new filesystems.

●Managed disk space using Logical Volume Manager (LVM) to dynamically resize, delete and extend file system non-destructively.

●Implemented RAID disk configuration for redundancy.

●Analyzed security and system logs to determine root cause to troubleshoot and resolve errors and issues on the Linux servers.

●Optimized system performance by tracking daily system utilization to determine if problems were imminent.

●Updated fstab to mount local and remote filesystem/partition persistently.

●Applied security and ports management using iptables to filter data traffic.

●Responded to security alerts with risk evaluation and monitoring/report on unauthorized access attempts.

●Provide users with sudo/elevated privileges for special tasks.

●Handled patching of production servers based on given patch cycles and times.

●Installed and managed packages using Yum and RPM tools.

●Provided support for implementation, troubleshooting and updates of applications on Linux/Unix Servers.


Bachelor of Arts in Business Information Systems from Coventry University


Microsoft 365 Fundamentals

CompTIA A+

Google IT Support professional Certificate (Date: Sept 4, 2021)

ISO 27001:2013 Foundation Course (IS-Information Security Management Systems)

ISO 27001:2013 Internal Auditor (IS-Information Security Management Systems, AU- Management Systems Auditing), Introduction to Packet Tracer

IT Help Desk Ticketing (Date: May 24, 2021)

Certified Information Security Manager (July 7, 2021)

Associate Member of ISACA (Date: Nov 18, 2020)

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