You have the option of selecting the apps that you wish to "take with you" during the upgrade.

I have done OS upgrades on at least 3 of my BB's so far, and haven't ever lost anything that I didn't want to lose.

Thanks to Raptor for the update, and to all you tekky folks helping us not-as-tekky folks keep our tekky stuff up to date!

this OS is really good since .180 except the message problem.