Hi again
If this has been a problem for a while another option is to back up there PST's, Address book / contacts / signature's etc. Then re-install office.
With office 2007 if you use windows "uninstall feature" even with out backing up the pst's reboot the PC and re-install office the PST's in the profile will populate outlook automatically. (but to be safe I always back up the PST, contacts etc)
If the PST’s in outlook are to big they will run into functionality / speed issues like, searching, deleting, accessing the calendar etc.
To disable the add-ons
Goto Tools - Trust Center and click the Add-ins tab. There's a GO button at the bottom of the dialog screen, click that button and uncheck (disable or even remove) the Outlook add-ins (like GoogleDesktop, iTunes Add-in, Acrobat PDF Maker, Mindjet Mindmanager, etc) that you no longer use.
[Do not disable the Windows Search Indexing addin]
To run outlook in safe mode for testing
Start Outlook 2007 in Safe Mode
If none of the above tricks, try running Outlook 2007 in safe mode (start -> Run dialog and type outlook /safe). The second option is to disable all your email rules and filters. And if Norton antivirus or Zone Alarm is configured with Outlook, disable that association. One of these actions should identify the culprit that's making Outlook to crawl.
Hopefully this will help. Mike