Using older versions of Outlook for Mac in business environments
The Remove All command applies to only one message at a time. You cannot select multiple messages and use this command.
You can, however, create a rule that you can run manually to remove messages from multiple messages.
- Select Tools menu --> Rules... and create a new rule for your account type (POP, IMAP or Exchange).
- Name the rule something like "Remove all attachments".
- Set When a new message arrives to All Messages.
- Set Do the following to Remove Attachments.
- UNcheck the Enabled option so that this rule does not run on any incoming messages.
To use this rule you can select one or more messages, right-click or Control-click it and select Rules --> Apply --> Remove all attachments.
Hope this helps!