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Metalogix Essentials for Office 365 2.7 - Performance Optimization Guide

How do I migrate Item ID's from a source SharePoint environment to a new target?

Item IDs are typically not preserved during migration, and it is recommended to not use them as a form of identification for Items in a SharePoint list or library. However, sometimes it is important to preserve these values for reference cases.  To do so, use the following process:

1.Copy source list to the target without any content.
migrating item IDs 1

2.Go to the newly created target list and add a field to be mapped to (Legacy ID in this example).
migrating item IDs 2

3.Refresh the target site in the tool.
migrating item IDs 3

4.Copy all items from the source list to the target list, then find the newly created field on the mapping screen.
migrating item IDs 4

5.Choose the downward facing arrow for the added field (Legacy ID), enable hidden columns, then choose the ID field to map from, then click “Finish” in the wizard.
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6.Post-migration, review the list in the target to verify that IDs were preserved to new column.
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