Close the email and say Yes to save changes.
If it's not being saved into drafts, you have changed a setting in outlook.
Try here for that setting:
Tools |options | email options (I don't have that version in front of me but
expect the setting will be there or maybe one more level in at Advanced
Email Options.)

Signature
Here are some tips about how to post questions:
http://support.microsoft.com/?id=555375
Regards
Judy Gleeson
MVP Outlook
Trainer and Consultant www.pragmatix.com.au
.
> On my old laptop, a partially drafted email would default to the draft
> folder. How do I get Outlook (Office 2003) to save a partially composed
> email as a draft?