Have you tried it immediately after a new reboot of Windows?

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Milly Staples [MVP - Outlook]
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After furious head scratching, loatcheek asked:
| when trying to export my calendar to excel the "import and export
| progress" box shows the process about 3/4 complete and will not go
| beyond that point. To clear it I have to close outlook and re-open.
| I was able to successfully export the calendar recently but now it
| keeps freezing, anyone experience this before or have advice?