To reproduce:
- Select an OpenPGP encrypted and/or signed mail (probably S/MIME would work, too but T8420: GpgOL: Outlook crashes on preview of a S/MIME mail…)
- Wait till the mail is displayed, then move the mouse over the GpgOL Group in the ribbon.
No tool tip text will be displayed, instead Outlook will crash (might take a few seconds) and maybe restart, maybe not.
Windows event viewer reports that Outlook crashed during the callback of the 'IRibbonControl' interface when launching GpgOL.
GpgOL log:
Showing the tooltip for not-crypto mails works.