they somehow made it worse and use a less capable version with smaller context window.

The only potential upside for businesses it that it can crawl onedrive/sharepoint, and acts as a glorious search machine in your mailbox and files.

That's the only thing really valuable to me, everything else is not working as it should. The outlook integration sucks, the powerpoint integration is laughably bad to being worthless, and the excel integration is less useful than Clippy.

I actually prefer using the "ask" function of github copilot through visual studio code over using the company provided microsoft copilot portal

Someone somewhere understands that ChatGPT as a brand is too valuable to have it ruined by middle management. Hence Copilot.

Depends on the flavor. Now has Claude, as well. And Copilot Studio can extend to any model AI Foundry supports.