Change stream · Classic Outlook known issues
[FIXED] Classic Outlook Contacts that have an X509 S/MIME certificate added to the Global Address List can no longer be edited with Operation Failed error
1 Sep 2025 · Outlook
Source excerpt
Classic Outlook Contacts that have an X509 S/MIME certificate added to the Global Address List can no longer be edited with Operation Failed error
A short excerpt. Read the linked source for the full article and context.
Guidance for this product
Monitored guidance in the same product area; this does not establish that the article cites each page.