Exchange 2010 SP1 Update Rollup 4–removed from download site

Microsoft have pulled the above mentioned Update Rollup due to a number of issues seen in the field .  So much so that Microsoft have taken action to remove it from the update site.  Their blog post here talks about how there is the potential for data loss if the Public Folders are moved from within Outlook.  Whilst the risk is minor they have pulled the update and will leave it until August to fix when they release Update Rollup 5 for Exchange 2010 SP1.