@BHOLA - Thanks for the question and using MS Q&A platform.
Yes, you can purchase Microsoft 365 Compliance to use Purview if you only have Microsoft 365. However, if you want to use Azure Purview, you will need to spin up an Azure resource, which is a Purview account in Azure. To use Microsoft Purview, you need to purchase a separate license for the service. You can purchase a license for Microsoft Purview through the Azure portal or through a Microsoft licensing partner.
If you upgrade to E5, you will get Microsoft 365 Compliance included, which means you can use Purview without purchasing an additional license.
As for when you would need Azure Purview, it depends on your specific use case. Azure Purview is a data governance solution that allows you to discover, understand, and manage your data across your organization. If you have data stored in various locations, such as on-premises or in different cloud providers, Azure Purview can help you bring all that data together and provide a unified view of your data. Additionally, Azure Purview provides advanced capabilities such as data classification, data lineage, and data cataloging.
So, if you have a need for data governance and management across your organization, Azure Purview may be a good fit for you. However, if you only need to manage data within Microsoft 365, Microsoft 365 Compliance may be sufficient.
For more details, refer to MS Q&A thread which addressing similar issue and Overview of pricing for classic data governance solutions in Microsoft Purview.
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