Hello all. First post so I hope I am in the right place :-)

Using Vista SP2 and Office 2007.

I keep losing justification after using the return key and wondered if there was a way round this please. May I explain?
At the start of the year I create a business diary in Word thus in advance and the whole document is set to 'justify'. E.g.
Mon 011012
Tue 021012
Wed 031012
Thur 041012 etc

If I wish to add text to say Wed 031012 I place the cursor after the '2' and use the return button to start a new line thus:
Wed 031012
Meeting at Smith's 1pm and they agreed new contract for 250 laptops at £125,000.

As soon as I hit return the otherwise justified document changes to 'align left' and I either have to highlight the new paragraph and select 'justify' or 'select all' and 'justify' the whole document again.

Why does it do this? Is there a setting to make sure the whole document remains justified without changing the last line of a paragraph. By that I mean if the paragraph is say 6 lines long, the first 5 remain justified whilst the last line if only a word or two automatically left aligns. Any advice much appreciated. Thanks.