Changing the source mailbox on a second migration to the same target mailbox is causing the second migration to not see the original calendar items on the current source. This causes ODME (On Demand Migration for Email) to synchronize the missing items on the source as deletions to the target.
2021-06-15 11:44:38,822 291 deletions of appointments from the source calendar 'Calendar' have been synchronized with the target
Scenario:
Source1 -> Target1
Source2 -> Target1
Source2 calendar will overwrite Source1 calendar items due to those items not being found in Source2 and will be synced as deletions to the target mailbox.
The original source mailbox may be migrated again to restore the original calendar items to the target mailbox.
To avoid this issue the source mailbox should not be changed and then migrated to the same target location. If you require migrating multiple source mailboxes or an archive into a single target primary mailbox, open a Quest Support Request to disable syncing calendar deletions (SyncCalendarDeletes) during your migration.
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