@wenli su Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
You can verify by command "az resource list --resource-type Microsoft.ClassicStorage/StorageAccount" and by navigating through the Azure portal as mentioned above.
The email that you have received is a standard message that does not require any action from your side. You can safely disregard it.
Additional information :
1. Classic Storage Account Migration Overview : We're retiring classic storage accounts on August 31, 2024 - Azure Storage | Microsoft Learn
- Understand Classic Migration - Understand storage account migration from classic to Azure Resource Manager - Azure Storage | Microsoft Learn
3.Migrate Classic SA - Migrate a classic storage account - Azure Storage | Microsoft Learn Please let us know if you have any further queries. I’m happy to assist you further.
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.