Thank you for sharing your experiences. So Thunderbird on the phone is out for me (seems to be difficult to install and not really usable). For Dekko I`ve allowed access with no security anyway. I'm wondering if I am the only one with this problem. Maybe I should reinstall Ubuntu Touch and see if it works better then. I did set the settings back to default, then updated everything again, but it didn't help.

@Lakota I've just installed everything Ubuntu and Dekko. I also checked the update funktion in the system menu. It says everything is up to date. Is there an extra update funktion for Dekko?
I've tried several configurations for my mail accout until I could send and receive mails. Since then I keep the same configuration but Dekko behaves different: Yesterday it didn't fetch new mails, today it does, but only the subject line, no mail content. And it keeps collapsing when i try to create an new mail. If I answer a mail, it is stable. I'm really stuck here.

I'm using FP2 Ubuntu Touch (OTA 3) like imub does. I've tried Dekko, but it keeps collapsing when I create new mails and I don't get it to fetch new mails (only imported mails once after dekko installation). So I'm interested in a mail client too. Otherwise my Smartphone isn't smart anymore. I only have 300MB data volume per month, which was enough for me. But if I use webmail this wounldn't be enough I guess. I've read about Anbox, maybe I could use some other android mail app. Any other suggestions?

@hummlbach That's it. Thank you. I didn't know what that lock item was. I found the ics file at the expected position as mentioned above. When I conntect the phone via USB to the computer I can't see the hidden phablet files (and there is no lock item either). So I helped myself by copying the file in my phone to the dokuments folder on the phone and that folder I can access by computer.

I've got a Fairphone 2 with Ubuntu Touch and I'd like to store the ics file oft the calendar app on my desktop pc as a backup. I read it should be found in home/phablet/.local/share/evolution/calendar/system. But I have no access to that. Even if I mark "show hidden files", I can only see 5 folders (docs, downloads, music, pictures, videos). I don't want to sync the calendar, I only need the ics file.
Thank you for any help.