I have had intermittent good/bad results with the Blocked Sender list in Outlook 2007.

Names can be entered manually or by clicking the Block
Sender icon with the message open.

Checking the list afterward will show the name of the sender to be there.
This is will be the status for a few days, and then when checking the list, all names will be gone.
I downloaded an update for Outlook a few days ago,
thought all was OK because names were being retained on the list. Checked today-all names gone.

I can block senders at the web server, but this is a real
hassle if you have several senders to block,ie, advertising.

Outlook seems to work OK otherwise. Is it possible there
is some kind of conflict going on with Windows 7? I know
Outlook 2007 (I think) was released before W7 came out.
All help/advice would be appreciated.
Thanks