unable to send word docs as email

a user is unable to send word docs in word 2000 using windows 2000. when user clicks “file, send to, mail recipient (as attachment)” Outlook does not pick up the doc. Instead the dialogue box asking for an internet email account pops up. this also happens with excel. microsoft exchange is set up, Outlook is set up as coroporate or workgroup, yet it does recognize the send to command. any thoughts on what to try next?