Smart Schedules was working on my computer but for some reason I can no longer see the toolbar.

Start Outlook and re-enable Smart Schedules by doing the following:

If you are using Outlook 2002 and 2003:
Start Outlook and go to your Inbox
Select Help -> About Microsoft Outlook
Click Disable Items button
Select Smart Schedules and click Enable
Restart Outlook.

If you are using Outlook 2007:
Start Outlook and go to your Inbox
Select Help -> Click Disable Items
Select Smart Schedules and click Enable
Restart Outlook.

If you are using Outlook 2010:
Start Outlook and go to your Inbox
Click File tab -> click Options
Click on Add-Ins on the left column
Select Disabled Items for the Manage drop-down and click Go
Select Smart Schedules and click Enable
Restart Outlook.