BB Curve 8900 :: Outlook - Device Default Server Disappeared

Settings:
BB 8900 (replacement just delivered...and the problem below started)
Device OS 5.0.0.411
Device Manager 5.0.1.37
Default Services: <my primary email> (I also have a second BIS email attached, but the CICAL for that one has been deleted.)

After struggling for days to get rid of the Device Default calendar (in addition to the calendar associated with my primary email and which is set as default under Default Services), I finally got my whole BB calendar on to the one calendar it should be on: the one associated with my primary email. And lo and behold, the Device Default disappeared. hallelujah, I thought.

Having cleared out the calendar using Device Manager, I then opted for a one way sync from Outlook to my new BB with its one and only calendar now, the calendar associated with my primary email and listed as the default under Default Services.....