Migration Assessment Scan: Large Lists

Learn how to mitigate issues with Large Lists during migration.


Lists over 5,000 items have historically caused issues with the migration tooling, making the ability to predict the time it takes to migrate sites that contain a larger list to be problematic. If you have large lists that must be migrated to the new platform please work with your Microsoft migration contact to ensure they are aware of your large list requirements, as attempting to migrate the larger lists will require special care when planning the migration event.

Data Migration

List data is migrated. However, the larger the list the more unpredictable the migration process has proven. Extremely large lists can result in an extended migration, which is longer than the original 500GB per wave estimate. Please work with your Microsoft migration contact if you have lists larger than 5,000 items.

Important: Any site that is configured as “No Access” (locked), in SharePoint will be skipped. To see a list of locked site collections see the Locked Sites scan output.

Preparing for Migration

Investigate the large lists and determine the need for this content to migrate to the target environment.

Post Migration

The migration tooling has built-in validation to ensure all the list items are migrated. You will want to validate the large lists migrated as expected.

Scan Result Reports

LargeListItemCount.csv    This scan report provides all lists that have over 5,000 items.




URL to the site collection that contains the list.


Site collection owner.


Url to the subsite that contains the list.


Title of the list.


Url to the root folder of the list.


Number of items in the list.

List Template

Template used when creating the list.


The type of list configured.


User that created the list.


Date/Time an item was last modified on the list.

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