Hi Alan,

You mentioned in your original post to the list that:
>> I Used Migration Assistant to copy all data from Time Machine. The backup 
>> has been erased.
And the original iMac hard drive has been erased as well.
If that is the case you don’t have a ‘backup’ that you can use to restore the 
original Mail Mailboxes & their messages from.

Kind Regards,
Ronni

 Ronni Brown’s iPad Pro 12.9-inch 256GB 


> On 30 May 2019, at 6:24 pm, Alan Smith <[email protected]> wrote:
> 
> Hello Ronni
> 
> Thank you for your comments and suggestions.
> 
> To clarify the problem, all four mail accounts are OK and appear in the Mail 
> Sidebar, with their respective sub folders Sent, Spam and Trash.  All 
> accounts are online.  Missing from the Sidebar are previously created 
> Mailboxes such as Personal, Financials, Bills, etc.  Most of these mailboxes 
> had sub folders, eg the Bills mailbox had Water, Gas, Electricity etc.  I 
> don’t recall having any active Smart Mailboxes.
> 
> It seems the actual original mailboxes and their content have gone.  Yes, I 
> can drag a greyed out mailbox off the bar and it disappears.  Yes, I can 
> create a new mailbox to display in the sidebar and can then drag a copy to 
> the bar. 
> 
> Web blog sites that suggest that missing emails can be recovered seem to be 
> promoting commercial software without giving anything more specific about how 
> to do a recovery!  
> 
> I have one untested Time Machine backup. The original iMac had its disk 
> erased and macOS reinstalled and is no longer available.  I have the use of a 
> very unstable MacBook Air that might accept selective restoration from Time 
> Machine.  Do you think this is worth trying?  Or just accept that the emails 
> cannot be recovered.
> 
> Cheers
> Alan
> 
> 
> 
>> On 29 May 2019, at 4:42 pm, Ronda Brown <[email protected]> wrote:
>> 
>> Hello Alan,
>> 
>> My replies in Situ below in colour:
>> Before attempting any of my suggestions below, I would suggest you backup 
>> first.
>> 
>>> On 26 May 2019, at 12:24 pm, Alan Smith <[email protected]> wrote:
>>> 
>>> 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.
>> 
>> When you ‘Add a mailbox’ to the The ‘Favourites Bar’ by dragging the mailbox 
>> from the Mail Sidebar, Mail doesn’t actually move the mailbox; it adds an 
>> alias for it to the Favourites bar.
>> You could have lost your link to the server.
>> Check the Mailboxes you dragged to the Favourites Bar from the Sidebar are 
>> NOT Disabled?
>> Go to Mail > Preferences > Accounts tab - check they are all online.
>> 
>> If all accounts are online & you still have the Favourites mailboxes greyed 
>> out.
>> Drag the greyed out mailboxes out of the bar and they will disappear, then 
>> drag new ones from the sidebar to replace them.
>> 
>>> 
>>> I Rebuilt the inbox for my main mail account but this made no difference.   
>>> ~/Library/Mail/ contains V5 and V6 folders. 
>> 
>> The V5 folder is used by High Sierra.
>> Before doing anything, make sure you have a current backup.
>> 1. Quit Mail and move the V5 folder to the trash, but don't delete it. 
>> 2. Open Mail and verify everything still works OK and all your messages are 
>> there. 
>> Once confident everything is OK, you can empty the trash.
>> 
>>> 
>>> 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
>> 
>> Cheers,
>> Ronni
>> 
>> 13-inch MacBook Air (April 2014)
>> 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
>> 8GB 1600MHz LPDDR3 SDRAM
>> 512GB PCIe-based Flash Storage
>> 
>> macOS High Sierra 10.13.6
>> 
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