Issue
Mailbox Migration may fail with the error, “Error trying to Get Master Category List” if the Outlook Category count is too high.”
Solution
You can remove custom categories and restore the out-of-box defaults by launching Outlook with the following switch: outlook.exe /cleancategories or you can remove categories from batches of email using search.
To remove categories from a group of items, sort by category or populate a search folder. In a search folder, press Ctrl + A to select all the items in the folder. In a simple sort, select grouped messages by holding down the Shift key while clicking the first and last message in the group. Then, right-click the Categories field and uncheck the appropriate categories.
You can also select Clear All Categories, but use caution. Doing so will remove them all, even categories you forgot you were using and might not want to remove.
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