Outlook 2010 woes

[Konstantin Khomoutov]

On Wed, 12 Oct 2016 10:59:33 -0500
Bryan Holloway <bryan at shout.net> wrote:

[...]
> New server:
> * Debian GNU/Linux 8.6
> * Dovecot 2.2.13
> * Maildir++
> * Quotas enabled
> * LDAP
> 
> Basically what's happening is that users are seeing large delays when 
> navigating between different IMAP folders. So, for example, user "X"
> is sitting idle in their INBOX. If they then click on another folder 
> there's a good 6-7 second delay before you can view its contents. If
> you immediately then navigate to other folders, you get a rapid
> response. But if the client then goes idle again for 10+ seconds, you
> will get this delay again. Some are reporting the OS saying "Outlook
> is not responding." (Everyone is running Windows 7.)
[...]
> Any help, suggestions, or pointers would be greatly appreciated.

Do you see

  imap(username) Disconnected for inactivity in=X out=Y

in the logs?

>From your description, it appears as if outlook gets disconnected at
some point, and that's why fast changing of the folders works OK (the
connection is live) and doing this after a pause forces a reconnect
with the following relogin.

Just a shot in the dark but still...