Return
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Title
Calendar migration error, "The Permission read access value TimeOnly can't be used with a non-calendar folder." -
Description
When migrating calendar items with On Demand Migration (ODM), in rare circumstances you may encounter the following error:
The Permission read access value TimeOnly can't be used with a non-calendar folder.
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Cause
This error is caused when folder permissions have been modified on a non-default calendar folder. In this case it is "Free/Busy" permissions causing the error in a Calendar/Birthdays folder -
Resolution
Exchange does not allow calendar specific permissions to be set on a non-default calendar folder. This error only affects the migration of folder permissions and can be ignored. The actual calendar data should be migrated without issue.