Morning all, annoyingly Windows decided to update itself over the weekend and rebooted my PC. This also happened with a few other work PCs and left users unable to login for an hour while it forced the update on us.

Luckily we only have a handful of Win 10 PCs and decided to leave the rest on 7 (wise move I'm now thinking!)

Anyway aside from that frustration, everything seems to be working except that our self-signed certificates no longer work.

We are using Excel 2003 and have macro security set to HIGH. The spreadsheets are still signed with our certificate but now Excel just treats these spreadsheets as if the cert doesn't exist. Has anyone else experienced this and could help please?