I have used below condition code to target other than outlook.

  <![if !mso]>       
  <table width="796" align="center" style="border-spacing: 0;border-collapse: collapse;padding: 0;vertical-align:top;text-align: inherit;width: 796px;margin: 0 auto;">

I have used this comment for previous templates. I didn't get any issue before.
But at recent time in outlook 2000, 2002 and 2003 displayed this tag (<![if !mso]>) at top of my segment.
I dont know why this issue occurs suddenly.
Please help me to resolve this.