How to delete the pim.vol file on Windows Mobile Professional devices
From CompanionLink Support
NOTE: This only works on Windows Mobile Professional. If it is a touch screen device, it is Professional. If it is not, it is Classic.
On the HandHeld, open File Explorer.
Click on “Up” a couple times, until it is at the top level.
There should be a file called “pim”. Rename it to something like “pim-bkup”.
Soft-reset the HandHeld.
There should now be no contact/calendar/task/memo data, and a new empty “pim” file.
Purge and Reload in CompanionLink again.
By renaming “pim” to “pim-bkup”, we created a backup and forced Windows Mobile to recreate an empty “pim” all at the same time.
If it’s necessary to restore this backup, rename “pim” to something else, then rename “pim-bkup” to “pim” and soft-reset.