When selecting "Migrate GroupWise Proxy Rights to equivalent Exchange ACL and Delegate settings" on the "Specify How to Migrate Shared Information" and the user has only been given read access to the calendar on the source, the users are showing as having the correct permissions on the Calendar Properties but also as having delegate access,
This is be design. By selecting the account that should only have read access on the delegates section and then choosing "Permissions" you can verify that the user should only have "Reviewer (can read items) enabled on the Calendar.
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