Microsoft (MSFT) faced investor concerns over its relationship with OpenAI following an Oracle/OpenAI deal announcement, contributing to the stock's underperformance, as highlighted by Harbor Capital Appreciation Fund in its Q3 2025 investor letter. This comes amidst minor declines in MSFT's recent closing prices, with the stock closing at $488.02 on December 24, 2025.
Separately, the company confirmed on December 29, 2025, that its December 2025 security updates are breaking Message Queuing (MSMQ) functionality, affecting enterprise applications. Microsoft also rolled out GPT 5.2 to Copilot on the web, Windows, and mobile as a free upgrade.