Microsoft Workloads Modernization and Cloud Transformation on AWS
Ovlox India
Executive Summary
Ovlox India was operating a business environment based on Microsoft technologies, including legacy .NET applications, Windows workloads, Active Directory, Microsoft 365, and supporting collaboration and file services. As the environment evolved, Ovlox required a modern, secure, scalable, and integrated cloud platform capable of supporting its application workloads as well as Microsoft-based identity, productivity, collaboration, and end-user computing requirements.
Zaptoz Technologies designed and implemented an AWS-based modernization approach that combined application modernization, Microsoft workload integration, secure identity management, network segmentation, high availability, monitoring, backup, and operational automation - including transforming a legacy .NET Framework application to .NET 8, modernizing Windows-based application workloads on Amazon EC2, integrating Microsoft identity and productivity workloads, and implementing a secure AWS architecture.
Customer Challenges
1. Legacy Application Environment
- • Business application built on Microsoft .NET Framework 4.x.
- • Dependency on a traditional Windows-based environment.
- • Increasing maintenance complexity and limited flexibility for future scaling.
- • Dependency on manually managed Windows infrastructure.
2. Microsoft Identity & Directory
- • Needed a hybrid Active Directory architecture.
- • Integration between on-premises and AWS environments.
- • Centralized identity management and SAML-based Single Sign-On.
- • Controlled administrative access to cloud resources.
3. Microsoft 365 & Collaboration
- • Integration and modernization of Microsoft 365, Exchange Online, SharePoint Online, Teams, and OneDrive.
- • Objective: a consistent identity and collaboration experience integrated with AWS.
4. Windows File & Application Workloads
- • Windows application servers, Windows File Server, Remote Desktop Services, and database workloads.
- • Needed secure, manageable infrastructure with access control, storage, backup, and monitoring.
5. Scalability & Availability
- • Limited high availability and scalability in the existing architecture.
- • Needed load balancing, separated application/database layers, and multi-tier networking.
6. Operational Management
- • Significant manual infrastructure management.
- • Needed centralized monitoring, automated alerting, patch management, and backup automation.
The Solution Offered
Zaptoz designed and implemented a modern AWS architecture that brought together Microsoft workloads, cloud infrastructure, application modernization, secure networking, identity, and operational management.
- • Migration of the legacy .NET Framework 4.x application to .NET 8.
- • Windows-based application workloads deployed on Amazon EC2.
- • Hybrid Active Directory integration with Microsoft 365.
- • Exchange Online, SharePoint Online, Teams, and OneDrive integration.
- • Windows File Server and Remote Desktop Services.
- • Amazon WorkSpaces for secure end-user computing.
- • SAML-based Single Sign-On across Microsoft and AWS workloads.
- • Secure multi-tier Amazon VPC architecture.
- • Application Load Balancer for high availability.
- • Centralized monitoring, backup, and operational automation.
Microsoft + AWS Hybrid Workload Architecture
Detailed Solution Architecture
1. Application Modernization & Compute Layer
The legacy .NET Framework 4.x application was modernized to .NET 8, improving runtime capabilities, maintainability, and readiness for future enhancements. The modernized application runs on Windows-based Amazon EC2 instances in a private subnet behind an Application Load Balancer, with Amazon EBS for OS and application storage and an architecture designed to support future horizontal scaling.
2. Database Layer
The database workload (Microsoft SQL Server) was positioned as a separate infrastructure layer from the application servers, with restricted network access, private connectivity, Security Group-based access control, and backup and recovery mechanisms - reducing unnecessary exposure of the database environment.
3. Hybrid Active Directory & Identity Integration
Microsoft identity services were integrated with the AWS environment through a hybrid Active Directory architecture, delivering centralized user authentication, secure identity integration with Microsoft 365, application authentication, and SAML-based Single Sign-On - giving Ovlox a consistent identity experience across Microsoft and AWS workloads.
4. Microsoft 365 Integration
Exchange Online (enterprise email and messaging), SharePoint Online (document collaboration and content management), Microsoft Teams (communication and meetings), and OneDrive (file synchronization) were aligned with the identity architecture for consistent authentication and access management.
5. Windows File Server, Remote Desktop Services & WorkSpaces
Windows File Server workloads were integrated with Active Directory for secure, centralized file access with backup and operational monitoring. Remote Desktop Services and Amazon WorkSpaces provided flexible, secure end-user computing and remote workforce access, all governed by the same enterprise identity services.
6. Secure AWS Network Architecture
A multi-tier Amazon VPC separated a public subnet for internet-facing components from private subnets for application workloads and isolated database network segments, using a NAT Gateway for outbound connectivity, an Internet Gateway where required, and Route Tables and Security Groups for controlled traffic and workload isolation.
7. Security, Monitoring & Backup
Security was built into every layer - private workload placement, restricted database connectivity, IAM role-based administration, and SAML-based SSO - rather than relying on a single control. Amazon CloudWatch monitored CPU, memory, disk, application health, and logs with automated alerts, AWS Systems Manager handled patching and remote administration, and an automated backup strategy using AWS Backup and Amazon S3 improved Recovery Point and Recovery Time Objectives.
Key AWS & Microsoft Services Used
Business & Technical Benefits
Application Modernization
Migrated from .NET Framework 4.x to .NET 8 with a modern runtime, improved maintainability, and a future-ready application architecture.
Microsoft Workload Modernization
Integrated Microsoft identity architecture with hybrid Active Directory, Microsoft 365, Windows File Server, Remote Desktop Services, and Amazon WorkSpaces.
Security
Secure multi-tier AWS architecture, reduced public exposure, private application and database networks, and centralized authentication.
Availability & Scalability
Load-balanced application architecture, flexible EC2 infrastructure, and separation of application and database layers designed for horizontal scaling.
Operational Efficiency
Centralized monitoring, automated alerts, automated patch management, infrastructure inventory, and standardized administration.
Business Continuity & Cost
Centralized backup strategy with improved recovery capabilities, appropriate resource sizing, and consumption-based AWS infrastructure.
Final Outcome
The Ovlox modernization initiative transformed a legacy Microsoft-centric application environment into a modern, secure, scalable, and integrated AWS-based architecture - bringing together Microsoft application workloads, hybrid identity, Microsoft 365 services, Windows infrastructure, remote access technologies, and AWS cloud services within a structured and secure architecture, and establishing a strong foundation for further cloud-native adoption, automation, and security modernization as Ovlox's business and technology requirements evolve.
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