Azure to AWS migration happens post-merger, for AWS ecosystem consolidation or when engineering teams are AWS-native. This guide covers the assessment, cost and migration approach.
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Post-merger with AWS-first organisation, AWS broader managed service portfolio for specific use cases (Aurora, DynamoDB), engineering team preference, OCI or multi-cloud strategy, AWS marketplace availability for specific ISV solutions.
Azure VMs→EC2, Blob Storage→S3, Azure SQL→RDS/Aurora, Azure Functions→Lambda, AKS→EKS, Azure Monitor→CloudWatch, Entra ID→IAM Identity Center, VNet→VPC, ExpressRoute→Direct Connect, Azure CDN→CloudFront. Configuration differs significantly — not a simple swap.
Azure Hybrid Benefit does NOT apply on AWS. Windows Server on Azure with AHB saves 40% vs AWS on-demand Windows pricing. Before migrating Windows-heavy workloads from Azure to AWS, carefully model the Windows licence cost impact. AWS License Manager supports BYOL for some licence types. For Windows-heavy environments, Azure is typically cheaper — Azure to AWS migrations often focus on Linux workloads.
Azure egress: $0.087/GB. AWS ingress: free. 100TB: $8,700 in Azure egress charges. Use Azure Data Box or AWS Snowball for large datasets to avoid egress. Plan final cutover sync for minimal downtime.
Before migrating: AWS Control Tower setup (2-4 wks), Direct Connect or S2S VPN for hybrid, IAM Identity Center with Entra ID as identity source, Security Hub and GuardDuty enabled, Transit Gateway for multi-VPC routing. TCOIQ landing zone assessment identifies what needs to be built.
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