Thanks Waz - you were on the right track. Here's the solution from a Microsoft forum:
The reason you are seeing a difference when viewing the message in Outlook 2010 versus Outlook 2003 is that Outlook 2010 uses a different default font for displaying Plain Text messages than Outlook 2007 or 2003 did. The good news is that you can change the font that Outlook 2010 uses for Plain Text.
Here are the Plain Text defaults for different Outlook versions:
Outlook 2003 - Courier New, 10pt
Outlook 2007 - Consolas, 10.5pt
Outlook 2010 - Calibri, 11pt
If you want Outlook 2010 to display these messages like 2003 did, then you can specify Courier New as the Plain Text font, using these steps:
1. On the File tab, click Options.
2. Click Mail.
3. Click "Stationery and Fonts"
4. Click the Font button under "Composing and reading plain text messages"
5. On the Font tab, change the font settings.
6. Click OK three times.
Cherry Canaday
[MSFT]
Edited by Cherry CanadayMicrosoft employee, Moderator Thursday, November 04, 2010 2:04 AM
Here's the link for the full discussion:
http://social.technet.microsof...n-text-not-lining-upThanks,
Vince Bonamo