Absolutely an essential feature and not that complicated to implement !
@Protonmail team when will you respond, or at least evaluate this feedback (2 years old) ?

nested folders are a basic functionality of any mainstream email app. Protonmail will not be adopted in business until this is resolved. Current folder structure is too cumbersome

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I've used Protonmail for 2 years. I like most of what is offered. However, I need to use subfolders. Labels don't cut it for me. I'm also evaluating Startmail. I will probably make Startmail my main email service because they incorporate this feature. I'll decide the next billing cycle.

I can't understand why a paid email sub doesn't have basic UI functions - nested folders, adjustable width folder pane. I have to codify my folder names just to make them fully visible in the narrow folder pane. Beyond ridiculous.

This is a feature that must be implemented ASAP!

I totally agree but this is duplicate of https://protonmail.uservoice.com/forums/284483-feedback/suggestions/32773126-nested-folders?page=1&per_page=20 and https://protonmail.uservoice.com/forums/284483-feedback/suggestions/32780560-sub-folders

Next year it will be 2020 ... Why no sub-folders from the start? I think I know why but Im not telling. ADD basic Sub-Folders & get rid of or make deletable/editable the Archives Labels & Starred. Cheers

The pssibility to make sub-folders for storing emails would be appreciated. Ie. folders that have parent folders and the folders would show up in a hierarchial tree where the folders are currently displayed.

Especially for corporate users filing emails hierarchialy is of great help.

Of course I should have done my homework before subscribing to Plus, but the lack of nested folders (like Outlook) or labels (like Gmail) is a deal-breaker for me. Also, this does not seem to be a feature to be implemented anytime soon. I will regretfully cancel my subscription and refrain from importing my archive and using my domain with ProtonMail until this feature is added.

Lack of this function is preventing me from fully migrating from Google Mail to Proton. This should be a top priority feature add.

The current folder system sucks. I am considering hosting one of my domains my self for receiving emails and newsletters because I can't nest these and organize them.

This really is a key feature that is missing (especially for nerds like us who would use protonmail in the first place!)

I was thinking about upgrading just because I need more folders. But seeing that I can't have nested folders is making me have 2nd thoughts.

I agree with other comments below -- nested folders is an essential feature, and it's surprising it's not already part of Protonmail.

See above!

Hi, I love protonmail's vision and would love to move my business email to protonmail. However, given the amount of mail I've got, missing out on nested folders is a real deal-breaker for me. I hope this will be implemented soon so that can move away from G-mail.

I was expecting nested folders to exist in ProtonMail. I'm very disappointed.

Adding your vote to the most popular (most votes) copy of this request will have the greatest impact. Currently that is:
https://protonmail.uservoice.com/forums/284483-feedback/suggestions/32773126-nested-folders

I see there is a lot of interest, with other users, in the non availability of nested sub folders.

I have used Protonmail for over a year, having migrated from gmail. I miss the use of subfolders very very much.

I really hope Protonmail can take this up in their updates.