svchost.exe @ 100% disk utilization vs. Outlook.ost

svchost.exe @ 100% disk utilization vs. Outlook.ost Vista x32 box with Outlook 2007. Outlook is not running. Hasn't been fired up for several reboots. I stopped WMI service and Windows Search service. Machine is mostly quiet, and then servicehost.exe launches an instance and starts banging away at Outlook.ost file. I can't determine what is causing it.
Asked by: Guest \| Views: 189

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Guest [Entry]

"The OST file is a cache of what's ""live"" on the Exchange server and it's most-likely corrupted. You can either try running ScanOST.exe against it (c:\program files\microsoft office\office12\SCANOST.EXE) or try renaming outlook.ost to outlook.ost.old or something and then relauching Outlook. It will re-cache everything from the server into a new outlook.ost file.

It's very likely that even though the Windows Search Service is disabled, another process you have installed might be trying to index it. (Google Desktop or Xobni come to mind [though you may not have them installed.]) An anti-virus scanner might also be banging on the OST file too."