I have a Lenovo Windows 10 Desktop highly spec’d and running Microsoft Office 2016 with Outlook connecting to Gmail, but sitting there hanging on synchronizing forever. During this time no new emails come in or sent out.
A major problem was the user has a 120gb Mailbox which complicated the solution.
I spent around 8 hours yesterday reinstalling Office, Virus scanner, patching etc. Nothing worked,
File -> Options -> Advanced -> Send and Receive -> Send/Receive -.> Edit
Then un-tick “Get Folder Unread Count from Subscribed Folders”