Outlook 2010, "This operation has been canceled due to RESTRICTIONS in effect on this computer"

See: *https://support.microsoft.com/en-us/help/310049/hyperlinks-are-not-working-in-outlook *https://www.slipstick.com/problems/this-operation-has-been-cancelled-due-to-restrictions/ This issue can be a problem with the default browser settings where some registry keys are incorrect or corrupted.

P.S. Office 2010 reached its "End of Life" [https://support.microsoft.com/en-us/office/end-of-support-for-office-2010-3a3e45de-51ac-4944-b2ba-c2e415432789 in October 2020] and it has not been receiving security updates for newly discovered vulnerabilities. You should consider either updating Office -- which won't necessarily resolve its stupidity about a missing/uninstalled browser -- or, if the budget does not permit using Microsoft, take a look at LibreOffice, a free, open-source office suite: https://www.libreoffice.org/