Far too many times we have some settings.json or folders.json file issues and while there's sometimes relatively easy fixes for those, quite often we're left with having a restored mailbox that no longer has the user's custom folders. So to fix this we have to:
Go onto the server and navigate to the "Mail" folder for the User to see what physical directories exist there (other than the standard ones)
Then, *for each* physical folder that exists on the server, use the "Rebuild Folder" button within the Admin UI by specifying the email address and the name of the folder.
In some cases, we'll have a domain with 20+ users who have 20+ custom folders, so we'll be hitting the Rebuild Folder button 400 times. Not only is it time consuming, that's incredibly prone to errors (especially when trying to do it quickly)
What would be nice is if there was a version of the Rebuild Folder window that had an "auto-detect based on physical folders" option that looped through all the directories for all folders, including the standard ones, and made sure that every folder on the server was visible within the Webmail. If for whatever reason that creates extra folders in the Webmail, then the user at that point can decide if they want to delete them along with any messages within them.
That option gets you 3 gold stars.
For 4 gold stars, make that a domain-level "Rebuild All Folders Based on Physical Directories For All Users" button. In our case it seems like whenever folders go missing for one user within a domain, all the users on the same domain have the same issue. So for us it's pretty common to have to do this for all users in a domain, so a button that looped through them all would be great.
For 5 gold stars, make it a server-wide button to repair all users of all domains. We had a pretty big server issue last week where somewhere between 10 and ??? (reports are still coming in) of our 500+ domains on the server had various forms of corruption. Having a server-wide "repair all" button would allow us to be proactive with our users rather than reactive.