This morning, Microsoft re-released their previously withdrawn Update Rollup 4 to the download center.
The re-release fixes the issue with subfolders and content being deleted when trying to move or copy a folder using Outlook.

More details about the issue can be found here:

• http://blogs.technet.com/b/exchange/archive/2011/07/13/exchange-2010-sp1-ru4-removed-from-download-center.aspx

The re-release update can be downloaded from Microsoft's Download Centrum here:

• http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=26910

For more technical and background information on the re-release, please take a look at the following posts:

• http://blogs.technet.com/b/exchange/archive/2011/07/27/announcing-the-re-release-of-exchange-2010-sp1-rollup-4.aspx
• http://blogs.technet.com/b/exchange/archive/2011/07/27/an-update-on-exchange-server-2010-sp1-rollup-update-4.aspx