You can limit the length of time articles are kept in a Microsoft NNTP Service newsgroup and also how much disk space a newsgroup can occupy by defining expiration policies for newsgroups. An expiration policy can apply to a single newsgroup or to any number of newsgroups. You can define as many policies as you need. In each case, the oldest articles are deleted first.
If you do not specify an expiration policy for a newsgroup, you should delete articles manually when they are no longer needed.
To create an expiration policy:
Note Internet Service Manager (HTML) does not use a Wizard for creating expiration policies. Choose Add, and follow the instructions on the screen. Choose Help if you need more information.
You can modify an existing expiration policy, including changing the newsgroups to which the policy applies, using the General (Expiration Policy) property sheet.
To modify an expiration policy: