Win 8.1 pro, Office 365, Outlook 2013. Send/receive works fine for a short period of time (maybe 5 minutes) after launching Outlook 2013. Then, send/receive fails. status bar says "SENDING MESSAGE" and the message on the windows tray outlook icon is "Microsoft outlook is requesting data from the server".
Have to close and restart outlook to complete the send/receive. then, after a few minutes, the behavior repeats.
Running outlook in safe mode does not solve the problem.
No AV on the machine.
Machine does not lose network connectivity. Network connectivity is perfect.
I can reproduce this problem on multiple computers, connected to different networks.