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1. View Reading Pane At The Bottom
2. Close Zimbra desktop
3. Open Zimbra desktop
You will now see two columns for Account. Close and open zimbra again, and you'll have four Account columns. Switch to Reading Pane On The Right and back to Reading Pane At The Bottom, and the Account columns reset back to one.
Bugzilla
Wiki
Source
display error in multiplying Account columns 
Linear Mode
