This method will guide you to configure Outlook options and add prefix line for original message in replying message to mimic quoting in Outlook. Please do as follows:

1. Click File > Options to open Outlook Options dialog box.

2. In the Outlook Options dialog box, please click Mail in the left bar, go to the Replies and forwards section, and then select Prefix each line of the original message from the When replying to a message drop down list. See screenshot:

3.Click the OK button to close the Outlook options dialog box.
From now on, when replying an email in Outlook, it will automatically quote original message with adding a blue line before it in the replying message. See screenshot:

Sometimes, you may need to quote only a part of original message in the replying message. Of course you can delete unnecessary content manually. But, here I will introduce Kutools for Outlook’s Reply Selection feature to help you reply with quoting a selection of original message easily.

1. Follow step 1-3 in above method to enable the Prefix each line of the original message option from the When replying to a message drop down list in Outlook Options dialog box.

2. In the Mail view, double click to open the email you will reply.

3. In the opening message window, select the content you will quote in replying message, and click Kutools > Reply Selection. See screenshot:

4. Now only the selection is quoted in the replying message. Please compose and send the replying message.

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