Verizon just posted their new device software for the 8830. It is version 22.214.171.124. I am still loading it, so no report yet. Find it here
BB 8830 CDMA Devices: Pkg v126.96.36.1991/App v188.8.131.52/Plt 184.108.40.206
While this OS fixes the calendar issues, if you're just having calendar sync issues RIM has released a patch for older OS versions to fix the calendar issue: Click Here
To install this update:
1. Download and install the latest version of Desktop Manager
2. Donwload this OS and install it to the PC.
3. Delete the vendor.xml file located in c:\program files\common files\research in motion\apploader (this step is necessary any time an OS is installed from a different carrier than what is branded on the BB.)
4. Plug in BB and open Desktop Manager. You should be prompted to upgrade.
Edited Blackberry.alx and instructions for unlocking vendor themes for this OS can be found Here
(Link to previous OS Click Here