Most
e-mail accounts have multiple folders. You probably have an inbox and
an outbox and folders for drafts and junk mail. Maybe you even have a
few custom folders. Sometimes mail folders need to be cleaned up and
organized. Because Windows Phone lets you select multiple messages
simultaneously, that’s a fairly straightforward task.
1. Open a Folder
In Mail, tap Folders.

Tap the folder you want to open. If you don’t see it, tap Show All Folders.

2. Moving and Deleting Messages
In Mail, tap Select.

Tap the check box to select the message you want to move or delete.

Do one of the following:
Tap Move to move the selected mails, and then tap the folder where you want to move them.
Tap Delete to delete the selected mails.
Tip:
You can also make the check boxes appear by tapping just to the left of any message.
Tip:
If you need to delete or move a
single message, you can also press and hold the message, and then tap
Delete or Move on the menu when it appears.