Bugzilla

Do not have a outlook account to reproduce.
But in gmail webmail account I can deliberately create a 'no-select'.

I created a folder/label  with the name 'Testing/Sub Test' as Nested under '[Gmail]/'
Please note 'Testing' is not a label in it's own right.  
Then in Thunderbird, 'Testing' is a 'no-Select' folder and it has a normal 'Sub Test' subfolder.


IF I did had the following:
Created a label called 'Testing' as nested under [Gmail]/ and then created a folder called 'Sub Test' as nested under 'Testing'
Then in Thunderbird I would see 'Testing' as a normal folder with 'Sub Test' as a normal subfolder.

Do not have a outlook account to reproduce.
But in gmail webmail account I can deliberately create a 'no-select'.

I created a folder/label  with the name 'Testing/Sub Test' as Nested under '[Gmail]/'
Please note 'Testing' at this point is not a label in it's own right.  
You may find Thunderbird auto removes the first 'Testing' by design and you may see the 'Sub Test' as a top level folder.

Therefore: 
Create a folder/label  with the name 'Testing/' (note the forward slash) as Nested under '[Gmail]/'
Create a folder/label  with the name 'Testing/Sub Test' as Nested under 'Testing/'
Perform a new Subscribe.

Do not have a outlook account to reproduce.
But in gmail webmail account I can deliberately create a 'no-select'.

I created a folder/label  with the name 'Testing/Sub Test' as Nested under '[Gmail]/'
Please note 'Testing' at this point is not a label in it's own right.  
You may find Thunderbird auto removes the first 'Testing' by design and you may see the 'Sub Test' as a top level folder.

Therefore: 
Create a folder/label  with the name 'Testing/' (note the forward slash) as Nested under '[Gmail]/'
Create a folder/label  with the name 'Testing/Sub Test' as Nested under 'Testing/'
Perform a new Subscribe. 
I do wish it was possible to add another image at this point - but I do not see how. So I've ahd to add it at the bottom again.