Simplest method I have found (Outlook 2007, right?) is to open a new message, and then drag and drop the calendar items into the message body (Right click and select copy). Compose your message informing the recipient to open and save each item.

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Milly Staples [MVP - Outlook]
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After furious head scratching, Gordon asked:
| I have a number of events spread out over the year that I need to
| invite one attendee to. They are all in the same category if that
| helps. Is there a way of inviting the attendee to all the events in
| one go, or do I have to do it event by event? (PITA if that's what I
| have to do....)
| Outlook 2007. Thanks
Gordon - 22 Jul 2007 09:48 GMT
> Simplest method I have found (Outlook 2007, right?)
Corerect, Outlook 2007
> is to open a new message, and then drag and drop the calendar items into
> the message body (Right click > and select copy). Compose your message
> informing the recipient to open and save each item.
That's what I did initially, but the attendee, who is on Outlook 2003, could
open the items but couldn't add them to her calendar...