Just a quick notice that few minutes ago the Exchange Team pulled Exchange Server 2010 Service Pack 1 Rollup 4.
As reported earlier, there were potential data loss issues with this rollup when moving folders around in public folders or PST files using any version Outlook; Note that moving folders using OWA through Exchange Web Services works fine.
A fix for this issue will be incorporated in the RU5 update which is scheduled for August. So, like RU3
v2 v3 which took about a month to appear after the initial RU3 release was pulled, we’ll have to wait until August for RU5.
For those who already deployed RU4 an interim update has been made available that fixes this issue. The interim update can be obtained by contacting support.