Hi,
There will be some problems if you upgrade ur BB8330 OS from 4.5 to OS5.
Here are the some of them which I face.
1. Once OS5 is updated and whenever you restart your handheld it will delete all your email & sms.
2. After each restart you will get a java error.
3. Sometimes names are not in display in CALL LOG.
4. It takes a lot of time to start.
I wish we must wait until our telecom introduce OS5.
But features are very nice is OS5.
Thanking you.