Remove a label from messages, in Outlook

Turning a folder off in Klasor only stops new labeling. If you also want the label gone from messages that are already labeled, you do it in Outlook, in four steps.

3 min read · updated Nov 8, 2026

Klasor never deletes labels and never removes them from messages. A Klasor label is an Outlook category, so removal is done directly in classic (Legacy) Outlook, with the menus below.

First, stop the labeling

In Klasor: on Automation, switch the folder off or press Remove from automation. Otherwise new messages in that folder get the label again.

The steps

1. Filter by categoryIn Outlook, open the folder and choose View → Filter By → Category, then the label you want to remove. The list shows only the messages that have it.
2. Select allEdit → Select All (⌘A). Check in the filtered list that these are exactly the messages you want.
3. Clear the categoryMessage → Categorize → Clear All.
4. Remove the filterView → Filter By → Clear All Filters. The message list returns to normal.

Good to know

• The filter applies to the open folder. Repeat the steps in every folder where Klasor set the label.
• The category stays in Outlook’s category list. You can delete it there (Message → Categorize → Edit Categories…), but do that after you have removed it from the messages.