Using New Outlook on Windows for personal email, calendar, and contact management
Same here. It's been in and out throughout 2025 so far. I primarily use Outlook for Web on Windows 10.
When I have this problem, I also typically am unable to RSVP to calendar events. I make my selection and then get an error on Outlook Calendar in web version that the change couldn't be made right now.
And, from time to time, my Teams messages also don't send.
And I've checked - downloaded "new" Outlook typically isn't syncing at that time either.
This is happening when other websites are working fine and I'm online via ethernet connection, not wifi.
It's definitely not a registry error or indexing issue since I'm primarily having website searching issues.