When you try to log on to Microsoft Office Communicator 2007 or Microsoft Office Communicator 2007 R2 you receive the following error message:
Outlook Integration Error
Additionally, when you click the message to display the details, you receive the following error message:
There was a problem connecting to Microsoft Office Outlook. The e-mail address used in your default Outlook profile is different from the sign-in address used in Communicator. Change your default Outlook profile to match the sign-in address you are using in Communicator, and then sign out and sign back in to Communicator.
This issue is caused by the e-mail comparison check in Communicator 2007. If the primary Simple Mail Transfer (SMTP) address on the user object does not match the one in the Microsoft Office Outlook profile, you receive the Outlook integration error message.
To resolve this issue, disable the e-mail comparison check. To do this, use one of the following methods.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
Install the Communicator 2007 Documentation Policies package. Note the location of the Communicator.adm file.
Note By default, this file will be located in the "Drive:\Program Files\Microsoft Office Communications Server 2007\Documentation\Communicator 2007 Policies" folder.
Click Start, and then click Run.
In the Open box, type gpedit.msc, and then press ENTER.
In Group Policy Object Editor, expand Computer Configuration, right-click Administrative Templates, point to All Tasks, and then click Add/Remove Templates.
In the Add/Remove Templates dialog box, click Add.
In the Policy Templates dialog box, locate the Communicator.adm file, and then click Open.
In the Add/Remove Templates dialog box, click Close.
In Group Policy Object Editor, expand Computer Configuration, expand Administrative Templates, expand Microsoft Office Communicator Policy Settings, and then click Microsoft Office Communicator Feature policies.
Double-click Disable email comparison check for Outlook PIM integration, click to select the Enabled option, and then click OK.