How to Fix Microsoft 365 PST Import Stuck at Analysis in Progress
Question details
The user's Microsoft 365 PST email migration job is frozen at 0% with an 'Analysis in Progress' status for several days, despite successful PST upload and CSV validation.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Migrating email data via PST upload to Microsoft 365 using the network upload method and mapping CSV.
- Observed behavior
- The import job remains stuck at 0% ('Analysis in Progress') for an extended period without progressing to the final import stage.
Ensure that your PST files were successfully uploaded to the Azure storage location using AzCopy and that your mapping CSV file contains no hidden formatting errors or invalid recipient email addresses.
Monitor the Job and Verify Mapping Data
Sometimes the Microsoft 365 server simply requires more time to process large PST files, or there may be a minor validation lag before the import option appears.
Microsoft 365 occasionally experiences backend delays when analyzing bulk data uploads. It is highly recommended to wait and verify your data inputs before escalating the issue.
Microsoft 365 can take several days to analyze large PST files. Allow at least 48 to 72 hours for the 'Analysis in Progress' phase to complete naturally during peak service times.
Double-check your CSV mapping file. Ensure all parameters (FilePath, Name, Mailbox, IsArchive, TargetRootFolder) are exactly correct, with no leading or trailing spaces, and that the Mailbox column contains active user email addresses.
Once the analysis completes, the status will update automatically. Select 'Import to Office 365' on the Import page to filter the data and finalize your email migration.
Contact Microsoft Support for Stalled Jobs
If the job remains stuck at 0% for multiple days and all mapping configurations are correct, backend intervention from Microsoft is required.
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Frequently Asked Questions
Why does the PST import say Analysis in Progress for days?
This usually happens due to very large PST file sizes, high server loads on Microsoft's backend, or subtle errors in the CSV mapping file that stall the internal validation process without throwing a direct error.
Can an AzCopy error cause the job to get stuck?
Yes. If AzCopy fails to upload the PST completely or corrupts the transfer, Microsoft 365 cannot analyze the file properly. Ensure the AzCopy transfer completes with a 100% success rate before creating the import job.
How do I cancel a stuck PST import job?
You can delete the stuck job directly from the Data Lifecycle Management > Microsoft 365 > Import page in the Microsoft Purview compliance portal. Once deleted, you can attempt to recreate the import job.
Is there a size limit for PST files during the import process?
Yes, Microsoft recommends keeping individual PST files under 20 GB. Larger files significantly increase the risk of the analysis phase failing, timing out, or getting permanently stuck.
