Combined Emails

for some reason I find my inbox emails are combined when from same sender and when I click on + it expands them. I checked options and only found under reading messages, automatically expand grouped messages. I don't understand why they are grouped. Can I get back to separate messages?

 

What email program are you using?

 

outlook express 6

 

I also don't recall seeing any option in OE6 for expanding/collapsing emails.

Did it happen at once or over a period of time ?

How about exporting & then importing the messages ?