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Because the volume of items transmitted daily in newsfeeds is considerable, USENET hosts must be able to keep up with the constant flow of data. If, for some reason, a host cannot process new items posted to newsgroups quickly enough, it can fall behind. The longer items are backed up waiting for the host to process them, the harder it is for the host to catch up.
The Internet News Service allows you to mark all items posted to newsgroups as delivered so hosts receiving the newsfeed can catch up to the most current newsfeed. Marking all messages as delivered enables hosts to flush their queues of newsgroup items waiting to be sent to other hosts. This is equivalent to deleting the items posted to newsgroups before they are delivered.
The Internet News Service enables Microsoft Exchange Server computers to catch up regardless of whether they are configured for push or pull feeds. For example, if your Microsoft Exchange Server computer is configured for push feeds and the host computer that receives your newsfeeds didn't process your feeds for several days, you can flush the queue of newsgroup postings waiting to be sent to the host. This enables the other host to ignore any old postings and process only the most recent postings.
When it performs a pull feed, Microsoft Exchange Server retrieves only messages that were posted since the last time Microsoft Exchange Server connected to the host. Microsoft Exchange Server also saves the time of that connection. The next time it connects to the host, it retrieves messages posted only since the saved time.
Setting all messages as delivered on a Microsoft Exchange Server computer configured for pull feeds not only flushes queued messages, it also resets the baseline time for future connections. This is useful if your server falls behind in processing newsfeeds received from other hosts. Instead of requesting information about items posted during the last several hours when it connects to other hosts, the Internet News Service requests information about items posted since the current time. Although no items are actually sent during this initial connection, the next time the Internet News Service connects to that host, it uses the previous time as the base for the request. For example, the first time the Internet News Service connects to a host, it requests all postings since the current time, for example 5 P.M. No postings are actually sent until several hours later when the Internet News Service connects to the host again and requests all postings since 5 P.M.