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Grouping items in lists
You can group all items by a column, such as Name or Subject. This puts the items with the same name or subject together. For example, this is a Mailbox grouped by subject:

A grouping column is displayed to the left of the Subject column in this example. The grouping column shows tree view buttons (Windows, Linux) or disclosure triangles (Mac) beside grouped items.
To group items for a particular column, Control-click (Windows, Linux) or Option-click (Mac) the appropriate column heading.
Another way to specify which column to group on is to choose the column at the view property "Group on".
There are two grouping rules to note:

If you
FirstClass does this
use both sorting and grouping
Keeps groups together and sorts the list as a whole by the first item in each group.
Items are also sorted within each group.
group the Subject column
Groups messages by message threads, rather than alphabetically by subject.

Collapsing and expanding groups

Do this
collapse a group so that you only see the first item in the group
Click the button/triangle beside the group.
expand a collapsed group
Click the same button/triangle.
collapse or expand all groups
Click the grouping column heading.
Use the view property "Collapse all groups".

If you collapse a group of items, then move or delete the displayed top item in the group, all items in the group are moved or deleted.

Ungrouping items
To remove grouping, Control-click or Option-click the grouping column heading.