Question : Use Microsoft Word 2003 to edit email messages unchecks itself

I have to go to Options -> Mail Format and check Use Microsoft Word 2003 to
edit email messages every time I start Outlook.   The setting is
not retained when the application is restarted - any suggestions?

Answer : Use Microsoft Word 2003 to edit email messages unchecks itself

Greetings ljhernan !

Are you using MS Word 2003 or another version?  Are you using Outlook 2003 or another version?
For MS Word to work with Outlook, it needs to be the same version as Outlook.

If using MS Word 2003 with Outlook 2003, make sure you save changes after making settings change in Format tab.

If no joy, run Detect and Repair from Help menu on both Word and Outlook.

If no joy, reinstall Office 2003.

Best wishes, war1