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.
>
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