Outlook stuck on synchronizing subscribed folders: Troubleshooting
https://businesstechplanet.com/outlook-stuck-on-synchronizing-subscribed-folders-troubleshooting-advice/
STEP-BY-STEP: CHECKING THE IMAP FOLDER TO RESOLVE SYNCHRONISING ISSUE IN OUTLOOK RIght click on your email account, and then click ‘IMAP Folders’. First, click ‘Subscribed’, and then swiftly navigate to ‘Query’. There will, presumably, be many options on your list. Select them all. In order to sync up the folders, select them all.
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