For some reason the calendar on my BlackBerry kept defaulting to the BlackBerry Messenger (BBM) group calendars whenever I created an event or Google Sync synchronized my calendar with my Google account. Obviously, this was very annoying because I didn’t want my private calendar entries to be shared with others.

Note: I strongly suggest that you back up all the data on your phone before doing this. Remember, you’re doing this at your own risk (don’t say I didn’t warn you)!

Method 1

To fix this, I had to delete the BBM application, and reinstall it.

Originally, I wasn’t able to delete the BBM application, because it was a “core” application, so I installed the latest version from BlackBerry App World hoping it would overwrite it as an “add-on” application.

After installation, I rebooted the BlackBerry, and deleted the application from the “Applications” menu under “Options” (the wrench). Again, I rebooted the phone.

I found that my calendar was still defaulting to BBM Groups – despite BBM being uninstalled. If you don’t have this problem, then awesome, reinstall BBM at this point. If you do, then go to “Options” –> “Advanced Options” –> “Default Services” and choose your account, and press the back button, saving your preferences. At this point I found that my calendar now defaults back to the proper account – not to BBM groups. I then reinstalled BBM, and everything was fine, and my group memberships automatically came back.

If it really matters, this was done on a BlackBerry Bold 9000 running OS 5.

Method 2

Now, I haven’t actually tried this method, so I can’t verify that this works – but this is what RIM’s support group on Twitter (@BlackberryHelp) suggested I do.

“To fix this issue you will need to create a backup and perform a security wipe and do not restore BBM groups: http://bit.ly/di72gD ^CB”

Hope this has been helpful!