We need to replicate an environment in Azure, running a clustered DB. The current physical environment is running on Windows 2003 and MS SQL Server 2005 R2.
We know that there's no OS/DB support but that it's possible to install these versions are run there.
However, how do you do the clustering side? There's no 'shared disk' as such. I believe in newer versions you use something called SIOS datakeeper that manages replication for you (for example, in a SAP set up: https://learn.microsoft.com/en-us/azure/virtual-machines/workloads/sap/high-availability-guide). Can you use this on Windows 2003, with SQL 2005, in Azure?