All I can add to this is anecdotal, from what we hear from ISP's and Telco's, and over the last year changes to the way Outlook behaves, everything from how it does auto discovery and setup, to smaller issues with SSL/TLS, make it seem that 'interoperability' is not a priority for some of the monsters in the industry.
This is NOT a dovecot issue, but a worrisome trend in the industry.
"If you want product XX to work flawlessly, you need to use product XX"
However, we are going to still have to play in their sandbox, as Outlook is still prevalent in the business community.
My 'tin foil hat' suggests that it is even a business tactic by some companies, to reduce competition. Those that are NOT working for "monsters" need to support each other, by adopting more open standard tools, which means we should all try to use open products, both email providers, and email clients.
Sorry, that doesn't help your situation though. Other than encouraging the use of alternative email clients ;) But for the most part, expect users not to understand. They just want things to work.
On 2022-01-13 2:07 a.m., Vladislav Kurz wrote:
Dear colleagues,
what is your experience regarding using outlook (2016/365) as IMAP client and dovecot on server side?
We have sync issues with outlook vs. cyrus IMAP server, and we consider moving to dovecot. But before that I'd like to hear from others if this combination works well. Especially if users have large and bushy mailboxes (>10 GB, >100 mailboxes), two mailboxes (accounts) on the same server.
I don't want to do the migration just to find out that it is general issue of outlook vs. any IMAP server.
-- "Catch the Magic of Linux..."
Michael Peddemors, President/CEO LinuxMagic Inc. Visit us at http://www.linuxmagic.com @linuxmagic A Wizard IT Company - For More Info http://www.wizard.ca "LinuxMagic" a Registered TradeMark of Wizard Tower TechnoServices Ltd.
604-682-0300 Beautiful British Columbia, Canada
This email and any electronic data contained are confidential and intended solely for the use of the individual or entity to which they are addressed. Please note that any views or opinions presented in this email are solely those of the author and are not intended to represent those of the company.