OK quick update, I have this in my BB MGMT logs:
Code:
[30002] (02/08 11:35:19):{0x11D0} Server = betemp01, Mailbox = /O=MyOrg/OU=LOrg/cn=Recipients/cn=oncall Description = The information store could not be opened. [MAPI 1.0 - [MAPI_E_LOGON_FAILED(80040111)]].
[30180] (02/08 11:35:19):{0x11D0} {oncall} CDOCalendar::Initialize - Error in call m_spCalendarFolder = m_spCDOSession->GetDefaultFolder.
[40000] (02/08 11:35:19):{0x11D0} CDO initializing failure in CDO helper 04c4dfd8 (1)
I am now certain that this is to do with the Exch/DC server being shut down earlier this week. I also had a look in the registry on the BES and found tons of references to this server. I'm not going to go hacking the registry btw, just thought this info would be useful.