User Preferences - Internet Mail

I have sent by user preferences for Internet Mail to be HTML and Plain Text but it keeps reverting back to HTML Only.

Can anyone advise how I can keep it at the HTML and Plain Text setting permanently.

Thanks for your help.

Subject: User Preferences - Internet Mail

Perhaps your administrator has applied a desktop policy that is resetting this each day.

Subject: RE: User Preferences - Internet Mail

Thanks Peter - your response has pointed me in the right direction. Cheers Kris