You are unable to use the keyboard to select options in the Recover Deleted Items
dialog box. While you can use the arrow keys to move from one item to another, you cannot use the keyboard to recover items or select toolbar options.
You must use a mouse or other pointing device.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Recover Deleted Items is an add-in that works with Microsoft Exchange Server version 5.5 or later, and allows you to recover items that were deleted from your mailbox on the server.
Some items or folders may not be recoverable because the length of time that deleted items are stored on the server is set by the administrator.
For public folders, the expiration date takes precedence over the length of time set by the administrator. This feature must be enabled on the Exchange Server by the administrator.
If you work primarily with offline folders, you must log on to your mailbox on the server to retrieve deleted items.