Address Lookup is not available.
Address Lookup is only available with BlackBerry Enterprise Solution accounts. Check that you are not in Flight mode and that you have an Address Lookup service book entry in the Service tab in the BlackBerry Connect application. See your IT administrator if the Address Lookup service book is missing.
The phone cannot register on the BlackBerry network. Check that data coverage is available.
The phone cannot get BlackBerry service when roaming.
Your phone automatically uses the operator that provides the best voice coverage, not data coverage, when you are roaming.
Before travelling ask your home operator which operators are able to offer you roaming data in the country you are visiting. Change your phone’s GSM Network search mode from Automatic to Manual and select the operator your home operator has recommended to you. To do this:
1.Select 
> Control panel > Connections > Mobile networks. Change the Search mode to Manual.
2.Select More > Select network on the menu, and
choose the recommended operator from the list. Select Done.
I cannot provision the phone.
If you provision by USB, you need to make sure that the phone is connected to the PC using the Sony Ericsson PC Suite for Smartphones.
All my meetings have moved some hours backwards or forwards.
If your operator supports Update time and you have turned this feature on you should turn it off in 
>
Control panel > Device > Time & date > More > Set updates. Change Update system time from Ask me to Never.
The downloaded attachment cannot be opened in BlackBerry Attachment Viewer.
Check that the attachment is one of the supported file types. See BlackBerry Attachment Viewer on page 11.
I cannot synchronize Calendar with the Sony Ericsson PC Suite for Smartphones.
When the BlackBerry [Calendar] service book is installed local synchronization is disabled because BlackBerry Connect software uses wireless synchronization.
Using BlackBerry Connect 27