One thing that’s worked for me when using Word (2003) to paste on other websites:
Go to Tools>AutoCorrect Options. Click on the Autoformat as You Type tab. Look at “Replace as you type” and uncheck the box that says " ‘Straight quotes’ with ‘smart’ quotes." Most websites don’t like these “smart” characters. Then when you cut and paste, the regular characters are there and may not get truncated.