Microsoft Outlook is requesting data from the server

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Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
Outlook/2007+Office 365

About a month ago I started getting a message: "Microsoft Outlook is requesting data from the server" in my tray. This completely freezes up Outlook. Typically, when I first start Outlook, it's fine for an hour or so then I get this message. I have to click the icon to "cancel server request" then it eventually comes back for a short time before the error persists again -- all day long.

The obvious answer is to upgrade my Outlook 2007 which is required by Office/365 by October anyway, but I'm in transition to a new machine and don't have room for an upgrade; need to get another couple of months out of this machine.

I have googled this error extensively. It is not due to my router or network because I have a laptop with Outlook 2013 that doesn't have this problem. It is not due to mailbox size because if I open a profile for a very tiny mailbox, I get the same problem. It is probably not a registry error because I setup a new user on my PC with a small/new e-mail profile and still get the error.

Any ideas on how I can solve this problem without reinstalling a newer version of Outlook?
Did it just start on or shortly after June 13? That's when a bad Outlook security patch came down. We know it affected custom forms with script behind them, iCloud, and attachments in Outlook 2007. If you think it fits that time frame, start with removing the update. Uninstall instructions (includes this specific update KB#)
Thx. No it started in May. I verified I do not have that update installed. I do not automatically install Office updates so that's not what triggered it. It does not coincide with anything in my environment. I haven't installed anything new. Just started one day and hasn't stopped.
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