Is 2 weeks,let me put it this way:
I use SeaMonkey Mail&News Groups, I didn't had off-topic set to download
the messages I had to see them online only, after a few days I set today
to download the messages and since it only had the headers couldn't
download the body for messages 2 weeks before today, so, SeaMonkey
Mail&News Groups started to delete those headers, proving the servers
time limited storage. I hope this is clear enough.
