Yes.

I would do it like this:

Group By Category.
Collapse all Groups (right click a group heading)
Ctrl Click to select each of the Category Groups you want to email
Grab any of those selected groups (where it's now blue) and drag to the Sent
Items folder.(it will take all selected groups)

All recipients will be in the To... field
To move them to the BCC field, wipe the lot to select them (click at the
bottom end, wipe your mouse up to the top left corner of the list)
Grab and drag to the Bcc field. (OOPS: turn it on FIRST if it's not on)

Regards

Judy Gleeson
MVP Outlook
Trainer and Consultant

There are various articles about using Outlook here: www.judygleeson.com
Canberra, Australia