A small update was released for Outlook 2010. This update fixes the following issues:
- When responding to a meeting request by using the Edit Response Before Sending option, the font is set to the system font unexpectedly.
- If you use Outlook Security Group Policy to configure a VSTO add-in as trusted according to Manage trusted add-ins it does not prevent security prompts when the add-in accesses the object model.
- When you send an email message that contains a Rights Management Services (RMS)-protected Office document and the recipient views the RMS-protected attachment in the preview pane, the last changed date of the attached file is displayed incorrectly.
For more information, see May 12, 2015, update for Outlook 2010 (KB3015585)