When migrating calendar with On Demand Migration for Email (ODME), the following error may occur:
The property has an invalid value. ICalUid
Failed to retrieve 1322 appointments from Calendar
When migrating calendar appointments, the error "The property has an invalid value. ICalUid" was considered as a folder-level error and, as a result, all appointments from this folder were not migrated.
This issue ODME-5400 has been resolved for On Demand Migration for Email (ODME).
Release 184.108.40.20607 (04/19/2019)
Now messages that generate the error are skipped, and the rest of the folder migrates in "one-by-one" migration mode.
Migrate the items that will not migrate into a PST file and import them into Exchange or Office 365.