MS Office 2011 for MAC has problems with Arabic BUT PowerPoint does support Arabic, Word does not by default but I found a solution to make it accept Arabic writing. Excel does not support Arabic yet.

Word will support Arabic if you do the following:

1- In your Gmail account open documents and create a word document and write any Arabic word like (عربي)

2- Go to File and Download as Word & save to your Desktop

3- Open Word in your Mac and open the save file that you created using Gmail.

4- Save as and change the format to Word Template (.docx)

close everything and when you go back to open Word in your Mac choose My template, you should fine the file and the name would be what ever name you have give to that file you saved from Gmail.

Now you should be able to write edit Arabic and save it to where every you like,