Gary Lapointe to the rescue: Using his Office 365 powershell tools to recover from a corrupted masterpage
I also need to give credit to the Office 365 support team over this. They were very quick in their response to my support incident, but I was quicker!
Whilst working on an Office 365 site for a customer today I had a moment of blind panic. The site is using custom branding and I was uploading a new version of the master page to the site when things went badly wrong.
Posted by Rik Hepworth on Friday, March 7, 2014