Migrating Legacy Application

Hi,

I am migrating a legacy ASP.NET application on Azure. The application uses Microsoft.Excel.Interop dll to work with MS-Excel.

In context of the above I have the following queries -

1. If migrated to Azure VM (IaaS) then can we install office on these virtual machines ? Can there be a licensing issue ?

2. If migrated to PaaS platform using a web app then what is the alternative to handle this Excel functionality ?

Please reply to me ASAP with your inputs.

Thanks