I am using Thunderbird on two Linux machines plus K9 on Android and I'm delighted with the way they all work well accessing the same email account. When it comes to calendar functionality, the two instances of Thunderbird work well together courtesy of CalDav hosted by my web/email hosting company. On Android, I have a gap. I haven't had a working calendar on my phone since I chose to stop adding entries into Google Calendar. I have two questions: 1) Does anybody know if Thunderbird for Android will have CalDav calendar functionality ? 2) Can anybody recommend a simple Open Source Android calendar app to fill what is hopefully a temporary gap ? Thank you