Users report that some of the meetings disappear from either Outlook 2007, OWA, or their mobile phone (windows mobile, iPhone, Blackberry). A meeting may appear in one or more of the applications/devices but not all. It appears that a mobile device is the common thread. Have worked with Microsoft enabling logging on Outlook 2007 client and on Exchange 2003 servers. Haven't been able to capture data describing a complete event from creation to loss. The problem is spreading, the natives are getting restless. This has been an ongoing problem for 3+ months.