Thanks for your response.
Yes, SE backup and restore is not included in stock 2.3.3, but I think it's a good app for backup SMS and Contact It did work on my X10 with stock 2.3.3 as well as WB 4 -> WB 7 before. For my recent case, I just tried turning back to my old WB 7b4 in this morning and restoring the same backup file, it was successful!
I also got back my contact in a different method, but it's somehow strange to me that why it doesn't work on TEAM ROM...
I'll look into this soon!
On a slightly unrelated note, I just unboxed my Xperia Arc S!