No, this feature is not available in Outlook. Using the control key is the
closest you can come.

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--?
Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.

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After searching google.groups.com and finding no answer, Juggler asked:
| I have a client that is migrating from GroupWise to
| Outlook 2003 with this question. In Groupwise there is a
[quoted text clipped - 9 lines]
| Thanks!
| Juggler