Outlook sent folder not updating
As of Outlook 2007, Outlook does not use the registry for a master category list; they are stored in the default message store (mailbox or pst).
If you are setting up a new system and using your old pst the color categories will be available on the new system.
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The views in outlook can become unresponsive causing it to not display the emails.
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This page sums up a few things I've learned about Outlook categories and color categories, with suggestions for using and managing categories along with troubleshooting tips.
You can assign one or more categories to any Microsoft Outlook item and consistent use of categories makes it easier to locate specific items.
Outlook has always supported categories, in Outlook 97 through Outlook 2003, they were simply Categories.
Outlook 2007 introduced Color Categories by merging the short-lived colored flags with categories.
You may need to right click on the root folder (Outlook Today), choose Properties and click the button to Upgrade to color categories. You can use Group policy to push Categories out to users, merging new categories with their existing categories.
In the Group Policy Editor (with the Outlook 2007 or greater ADM files installed), look under Miscellaneous.
She also created video training CDs and online training classes for Microsoft Outlook.