Just an update. We are opening a support call with RIM this afternoon (finally broke down and got a TSupport contract). However, in trial and error, we found the calendar issue appears to be related with the number of entries you have in your calendar. The magic number is somewhere between 500 & 600 items. I had 1999 items this morning when we found this.
I exported my calendar to a PST, then deleted everything older than January 1, 2010, leaving me with 146 items. My calendar never cleared after a BES reboot as it was doing previously. I then re-imported my 2009 entries, which put me at a count of 606 items, and upon BES reboot it wiped. One of the guys on my support team discovered this, and I know the number was over 500, but less than 600, but I don't recall the exact number he found to be the make / break number.
dcc
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