dovecot update from 2.1.16 to 2.2.36.4 but I have a trouble.

[iriya at peach.ocn.ne.jp]

Hi,I have a troble and can not resolve it. Please help me.

I updated dovecot from 2.1.16 to 2.2.36.4.
As a result, I had a client who could not access via imap.
The client showed his logs (- folder not exists:INBOX )
I did not change dovecot config files.

So I searched a difference between 2.1.16 and 2.2.36.4,
I discovered . Please refer below results.

[2.1.16]
a03 list "" "*"
* LIST (\HasChildren) "." "INBOX"
* LIST (\HasNoChildren) "." "INBOX.Drafts"
* LIST (\HasNoChildren) "." "INBOX.Sent"
* LIST (\HasNoChildren) "." "INBOX.Spam"
* LIST (\HasNoChildren) "." "INBOX.Trash"

[2.2.36.4]
a03 list "" "*"
* LIST (\HasChildren) "." INBOX
* LIST (\HasNoChildren) "." INBOX.Drafts
* LIST (\HasNoChildren) "." INBOX.Sent
* LIST (\HasNoChildren) "." INBOX.Spam
* LIST (\HasNoChildren) "." INBOX.Trash

For example, I noticed INBOX and "INBOX".
2.2.36.4 dovecot is no [""].

What should I do?