I was wondering if mail-in-a-box solution would suit us. We are a public blood bank with 350 mailboxes and we do not have groupware solution yet. We need it mostly for sharing calendars and contacts and it has to sync on mobiles and desktops.
At the moment we are using an old version of IMAP/Postfix for email and Roundcube for webmail and would like to change that too.
I never used shareable calendars, so I’m not sure if that’s possible. I would say: rent a vps, try to install it and within a couple of hours, you have your answer.
I’m running this for a couple of years and it’s quite stable.
The shared calendars in Nextcloud (which is installed as part of MIAB) work just fine - I use them Both in the Nextcloud interface and with caldav on iOS, MacOS and Android. I assume it’ll work fine with Windows calender applications too although I haven’t tried that.