Android Sync Doesn't Work Too Good

[Asai]

Greetings,

I'm getting reports from a user who's reading and deleting mail on 
Thunderbird, but read flags and deletions don't show up in his Android 
phone.  He's using the native Android mail app with the newest Android OS.

My question is, where do I start with troubleshooting this kind of 
issue?  Thanks for anyone's insight here. We're using Dovecot 2.2.13.

-- 
--Asai