When new Outlook, or Office for that matter is released, they are generally made to be backward compatible with previous versions. Due to various reasons, some third party add-ins that functioned perfectly in Outlook 2003 might not work or even misbehave and cause problems loading Outlook 2007. Here is how you can disconnect a misbehaving Add-in:

1. If an add-in causes Outlook to crash when Outlook is loading, Outlook 2007 should prompt you to disable the add-in. If it doesn’t and Outlook crashes then use the command line outlook.exe /safe to start Outlook in safe mode.
2. Select the Tools menu, and then Trust Center.
3. Click on the Add-ins tab (on left vertical tab pane), and then click the Go button at the bottom of the page.
4. Find that add-in and uncheck the box next to the add-in to disable it and click OK.

When you get a proper patch that makes your third party add-in compatible with Outlook 2007 and you want to enable it, you can follow the above procedure and just check the listed add-ins that you want to enable. While you can access this from the Trust Center via the Add-ins tab, the easiest way in Outlook is to select the Help menu, then Disabled Items. Find the add-in on the list of disabled items, select it, and click the Enable button to enable the add-in again.

If Outlook believes the add-in is misbehaving it can automatically disable it. There are some add-ins that are disabled immediately when Outlook is installed. In all cases, enable an add-in again only if you are sure that it will not cause any problems in Outlook.

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