Download Address Book in Outlook generates error 0x80190197
Users at a new remote site have reported that they are unable to download the offline address book (OAB) in Outlook as it generates an error:
Task ‘firstname.lastname@example.org’ reported error (0x80190197) : ‘An unexpected error has occurred.’
The Exchange environment is hosted at a different location so I confirmed that port 443 was allowed through the firewall. Then I discovered that this was a proxy authentication issue and was resolved by adding a proxy exclusion for the webmail address (as Outlook was trying to go out to the internet to access the Exchange server).