1. In Outlook, click on Help, Disabled Items
2. Click on the listed item that starts with “Blackbaud…”, then click on “Enable”
3. Click OK
4. Close and reopen Outlook

OR

1.  Launch Outlook from Raiser's Edge 
2.  Go to Tools, Macros, Security, Add-ins
3.  Enable the RE7Outlook add-in

The Raiser's Edge toolbar will be visible upon opening Outlook. 
If not, select View, Toolbars, The Raiser's Edge