tab in compose

[markza]

Im not sure if this question has been asked before but I cant seem to findt on the forums. When Im running Zimbra desktop and I click Compose new email and start writing my message while the cursor is in the message body compose block I cant use tab (put tab spaces between my text).. Tab key basically jumps the cursor out of the body block. Stupid thing I know but I have clients asking me about it.

Thanks alot..