How do I mark a read email unread in Gmail or Hotmail?

You can mark a read email message unread by doing the following:
For Gmail — 1) Log into Gmail account and select or tick the messages that you want to be marked as read or unread.
2) Click ‘More Actions‘. In the drop down menu, click ‘mark as read‘ to make the select item/s as read mails or click ‘mark as unread‘ to make the selected item/s as unread mail.
For Hotmail — 1) Log into Hotmail account and tick the messages that you want to be marked as unread.
2) Then click the ‘Mark as unread‘ button located in the actions/menu bar.