@d19dotca Oh wow, that sounds like exactly the symptom I was seeing of truncated contacts for ones with many phone / email addresses. Thanks for chiming in, I had no idea that was an Exchange ActiveSync limitation.
@luckow Thanks for the tip about enforcing use through Thunderbird/a compliant client. Any idea of how SOGo fares with iOS sync?
@jdaviescoates Thanks for the tip about the Sabre/dav request. I've added my feedback (not positive sadly) based on five years of active use of Fruux with various MacOS and recent version of iOS (I'm a relative latecomer to iPhones as I stopped using cellphones between about 2013 and 2018: now I have to have one for banking unfortunately and am surrounded by a pack of rabid iPhone users both at work and at home).
PS. Could someone somewhere please upvote a post for me so I can post more often than every six minutes.
We are not really experts on such specific configurations for SOGo but you could install an app and put it into debug mode if you are a developer using the cloudron cli tool with cloudron debug --app <appdomain> then login to the app with cloudron exec --app <appdomain> and start the app with /app/code/start.sh Then the whole filesystem becomes writeable and you can see how to tweak the configs as you want. If you have found a working combination, let us know and we can see how we can change the app package to allow such config to be persistent and updateable.
@nebulon Thanks guys, it works. Your support is good! I don't know how many people use cloudron as a private replacement of cloud services, but I think if you get all these details down and everything just works, there's a market for that 🙂