Hi Khosravan,

I don't often work in outline view, but I have encountered this in Word 2003 (appears to be okay in Word 2007).  It's more
pronounced if you have turned on the use of Draft Font (Tools=>Options=>View) for Outline and Normal views, so I've turned that
setting off.  Things do appear correctly in Print Preview.  While a little clumsy you can have the Outlining toolbar available
(View=>Toolbars) in other views as well, including Print Preview.

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I use two language systems in my computer. One is left-to-right (English) and
the other is right-to-left (Persian). Inside Word, in outline view, when I
use headings to show levels, in right-to-left system, it works fine but in
left-to-right system (English) it shows in opposite direction that is,
instead of showing from left-to right, it shows in the opposite side. Normal
text is also right aligned.
How can I solve this problem?
Windows XP, Word 2003>>

Since you have enabled the right-to-left language, word is defaulting the
direction of the outline view (and the document map) to that.

In order to fix it:
1. On the Tools menu, click Options, and then click the Complex Scripts tab.
2 Next to Document view, and click Left-to-right to display the document
with left-to-right direction.

Reference:
http://office.microsoft.com/en-us/word/HP052580811033.aspx