Receiving the error message DllRegisterServer failed with error code 0x80070005 may also occur even if you are logged on with Administrator rights. This error can also be caused by an attempt to update part of the registry that you do not have permissions to update. In my case, using regmon from SysInternals, I discovered that I was receiving an Access Denied when regsvr32 was trying to update the registry, and I had to edit the following registry entry: \HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MsOutlook.Con nectorManager.1 by right clicking on it, selecting Permissions, highlighting Administrators under Group or user names:, clicking on Allow Full Control, and finally clicking on OK

Only then could I successfully run C:\Program Files\Research In Motion\BlackBerry\IS71 Connectors\MS Outlook Connector>regsvr32 msoutlookconnector.fil