I've installed korean language and font support which came in blackberry_7250_upgrade.zip, but still not able to see emails written in Korean. Can some one help me with this?

My boss is Korean and initially we thought the BlackBerry would use the Korean language, but no. However, he was very pleased to be able to open an attachment and read it in Korean.

You can't flick the language in to Korean but you should be able to read emails written in that text, along with Japanese, Russian and a few others on the latest firmware release. What version firmware did you install??