A HUGE second for SOGo

We used it for many years in a Gentoo/Dovecot/Postfix environment.

It was super fast/snappy, and extremely reliable, and works perfectly with both Thunderbird AND Outlook (this was a huge plus for some of our users who ridiculously preferred Outlook)...

they also offer implementation and ongoing support services at very reasonable rates, but if you prefer to do everything yourself, the documentation is perfectly adequate, and their email support list should address any potential issues you might have.

SOGo rocks...

On 10/14/2022 3:35 PM, infoomatic wrote

On 14.10.22 16:13, Marc wrote:

I also do not want any other other 'crap' just the cal (and card) dav solution.

sorry about my suggestion, but I am just a big fan of SOGo (no
affiliation with) from sogo.nu ... it may not be a solution for you
because it offers caldav, carddav, webmail, but performance is top
notch, maybe you want to have a look anyway