Exchange 2010 W3WP High Memory Usage

Exchange 2010 High w3wp Memory Usage, it may happen that the w3wp service IIS going to saturate the Ram Exchange Server 2010 SP1.
This disruption can be caused by a worm Conficker.B, causing delays in the delivery of mail, with frequent disconnections client.

Solution:

Stop IIs

Downloaded from Windows Update, the update control worms in April
2011 and verify that there is rollup5 Microsoft Exchange 2010.