Hi, Just downloaded the free version and entered my yahoo email address and password. It has synched all the messages but I have recurring error message popping up. 'Server says “unauthorised” ’ and the box to re enter the login details. But it must already be working because it has all the emails downloaded already. 
same here with @me.com account… pops up randomly all throughout the day… but I still get my inbox messages and can send from it fine.
It is most probably caused by some CalDAV account. Please send us your CalDAV/CardDAV logs and I will be able to tell you more.
- No idea what you are talking about.
- Already removed this program in favour of Thunderbird.
I am really sorry to hear that.
For everyone who has similar problem:
Open Tools - Settings - Advanced - Logging, check CalDAV under the problematic account and simulate the issue. Then send us the logs using the same window. Thank you.