Questions about SPECIAL-USE IMAP extension

[Tanstaafl]

On Mon Jan 15 2018 18:11:24 GMT-0500 (Eastern Standard Time), Joseph Tam
<jtam.home at gmail.com> wrote:
> Tanstaafl <tanstaafl at libertytrek.org> writes:
> 
>>> Is this what you are looking for?
>>>
>>> https://wiki2.dovecot.org/Plugins/MailboxAlias
>>>
>>> It seems already be implemented...
>>
>> A first step maybe, but no, not quite.
> 
> So what are the gotchas of using this?
Read? From the link:

"This doesn't magically solve the problem of showing clients e.g.
multiple Sent mailboxes, but it can be used to make sure that all of the
different variants will have the same mails in them. Unfortunately it
also means that some clients will download the same mails to local cache
multiple times."

> How much does this free lunch cost?

? However much time it takes you to implement it?