Using classic Outlook for Windows in business environments
I saw about 23-24 January that error, i use Mailbird and i think was a simple disconnect, but just in Hotmail accounts i have this issue, Gmail or Corporative emails are not affected.
I downloaded Thunderbird because i changed IMAP/STMP servers but everytime i restart for syncro all email accounts and it happends again. First i could syncronize 1 account (was testing it) but when i close and open again, same error as in Mailbird, but in Outlook web it doesn't happend.
W10 with all updates here.