All personal mailboxes in the Favourites bar are greyed out on a new iMac (27 
inch 5K with Mojave 10.14.5).  I Used Migration Assistant to copy all data from 
Time Machine. The backup has been erased.

I Rebuilt the inbox for my main mail account but this made no difference.   
~/Library/Mail/ contains V5 and V6 folders. 

I normally move mail from my Inbox to the Favourites mailboxes.  I have mail 
archives (outside the Mail app) up to December 2017.  The Mail “Sent” folder 
holds all (?) messages from 2017. 

Can I recover my Favourites mail history?

Regards
Alan


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