Not only are broken lines and > characters the default in Outlook Express and Outlook, it's almost impossible to make them format replies correctly -- almost, because there's OE-QuoteFix.
OE-QuoteFix corrects much of the plain text reply handling in Outlook Express. It inserts '>' characters where they belong, rewraps the quoted message and can strip signatures automatically.
Send Perfectly Formatted Plain Text Replies in Outlook Express
To send perfectly formatted plain text replies with Outlook Express and OE-QuoteFix:
- Download and install OE-QuoteFix.
- Launch Outlook Express with OE-QuoteFix.
- Make sure your default for emails is plain text in Outlook Express.
That's all there is to fixing plain text replies in Outlook Express. Your next reply will be re-formatted automatically.
The default settings of OE-QuoteFix are sensible, but you can tweak styles and options to your heart's delight in the OE-QuoteFix dialog.

