On August 2, 2023, from 16:13 to 18:56 CET, a subset of users encountered problems with the automatic insertion of email signatures through the Email Signature Outlook Web Add-in in Outlook Desktop. The root cause was traced back to the incorporation of a method call that proved incompatible with certain users' environments, specifically affecting customers with an older version of Outlook that does not support the specific method call.

Upon identification of the issue, the engineering team promptly devised a solution by substituting the problematic method call with a compatible alternative. This swift intervention effectively restored the functionality for signature insertion, catering to users utilizing the older version of Outlook.

While the resolution for the incident was devised on August 2 at 18:56, its comprehensive implementation faced a minor delay owing to caching challenges encountered by select customers. The definitive confirmation of complete resolution from customers was received on the 3rd of August, toward the close of the day.