Outlook 2016 & IMAP Trouble with dovecot

[G A]

Reposting since it went under another thread somehow...

Hello List,

I'm facing an issue with dovecot (2.2.27) IMAP  and Outlook as a client. 
I have some users that use Outlook (2016) as  a client . One of them has 
a desktop PC in the office and a laptop machine which I've setup some 
days ago . The user did some work, during the weekend, in his laptop 
(filling messages into IMAP folders) and to his (and mine) surprise, 
today in the office he saw that none of his work is reflected on the 
server. Messages are not where they supposed to be .Tomorrow he will 
bring the laptop over to check, but I have seen this problem again in 
the past  again with outlook 2016 as a client (specifically I've had a 
user which during work he was deleting or renaming folders which appear 
fine on his copy of outlook (ost) but not on the server). Anyone has any 
experience with dovecot and outlook and related problems ?

thanks in advance George

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