For the last few days I can no longer send e-mails to groups in my contacts list.

When you go to the "to" line the groups aren't presented when you type the first few letters of the group or the entire name of the group.

When you go to the "people" section the groups are shown there with all the correct entries but if you select email group a pop-up comes up and opens another tab of your Outlook mail.

Ideas?