HOW TO
In earlier versions of ArcMap, such as version 9.3.1, it was possible to dock toolbars vertically between the Table of Contents and the Data Frame, a shown in the image below.
On ArcMap versions 10.x, this capability was no longer available. This is a known limitation. Newer versions of the software use the new dockable window framework which prevents docking toolbars between the TOC and the data view.
Article ID: 000025324
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