To prevent this issue from happening, we can turn off the “Smart Quotes” Feature in Outlook:

1. Open Outlook 2013.

2. Click File > Options > Mail.

3. Click Spelling and AutoCorrect button.

4. In the Editor Options window, click AutoCorrect Options button to open the AutoCorrect dialog.

5. Click AutoFormat tab, and then clear the check box before “Straight quotes” with “smart quotes” under Replace heading.

6. Click OK.

Please try and please let me know should you have any enquries. Thanks a lot.