Sending, receiving, and organizing email in Outlook.com
Hi, Isaac, thanks for reaching out and I know how confusing it.
Microsoft has a daily recipient limit, and that includes both emails and calendar invites. Even if you only sent a few emails, your calendar invite with 14 people adds to the total count. Once you hit the set limit, Outlook blocks you from sending more until 24 hours pass. The only fix is to wait for the limit to reset or reduce the number of recipients in one send.
Hope it clarifies everything.
Best,
Arlene D.