I have a client who just went through a "seemless" migration with a hosted exchange provider from Exchange 2010 to 2013 on the backend which has resulted in a loss of public folder favorites for all users.
Their PF content is quite large 36GB to be exact and their ISP connection speed is lack luster so re-adding the favorites is not desirable and would be last resort.
The migration did not require Outlook profile rebuilds and from a one to one comparison of Exchange mail box with local OST data it appears the PF favorites data is still present however not visible. For instance I have a user with a 3GB mailbox and his OST is 21GB and he was a heavy favorites user.
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