AFAIK, you can't since the Timeline view is only a fancy screen view of your task list. It is not printable except via Print Screen.
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Milly Staples [MVP - Outlook]
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How to ask a question:
http://support.microsoft.com/KB/555375
After furious head scratching, giles atkinson asked:
| how do I print a task timeline in outlook? Print button is grey
