my mail won't show after upgrading to 4.0.4 After upgrading my Samsung galaxy s2 to android version 4.0.4 my mail won't show in the default mail app (cant find out the name!). I only get a dropdown bar -- but when I clicked it, the arrow points below, but it doesn't "dropdown" ;( 

How can I get my mail shown?

Here is a screen-shot of my mail app.
When chaging Android major versions, GB to ICS or ICS to JB or even GB to JB, its advised to do a full wipe, since many old files from the previous version might collide with the new Android version.

Since you haven't done it, I suggest you do the following:


Backup all your phone's data with either Titanium Backup or a Nandroid backup if you have a custom recovery installed.
Get your phone to recovery mode and wipe all data (factory reset). If you have a custom recovery you can wipe /system, /data and /cache.
Once clean, reboot in download mode and use Odin to update to 4.0.4 (or 4.1.2 if you have the international version GT-I9100)
Reboot and enjoy a clean installation of ICS/JB.