![]() ![]() ![]() This advice to disable IPv6 brought success. The tenant admin says the license is active and IMAP is allowed.īlog reader Theo gave the advice to switch to oAuth2 after all and if there were problems, try the flag: Since the day before yesterday the IMAP access with Thunderbird to a MS365 account is not working.Įrror message: User is authenticated but not connected. Within my German blog reader Klaus left the following comment, reporting issues with Thunderbird IMAP connection since the end of 2022 (I've translated the comment). Reader report #1: Thunderbird fails with oAuth2 The issue was brought to my attention by two readers. However, there is the problem that the IMAP connection to Exchange Online via oAuth2 in Thunderbird is on strike. IMAP connection goes on strike in Thunderbird This means that all clients that want to access Exchange Online mailboxes via IMAP will have to switch to oAuth2 (Modern Authentication). Click on the disconnected mailbox, then select the minus ( – ) button at the bottom left of the Account Settings panel.In the article Reminder: Basic Authentication in Exchange Online will be switches off in 2023, I pointed out that Microsoft will finally switch off Basic Authentication in Exchange Online at the turn of the year 2022/2023.Ctrl+Click each item, or select the top item, then shift+click the bottom item.If you have items in your draft folder that aren’t saved in the newly connected mailbox, copy them over to your newly connected account’s Draft folder.Resend those emails from the connected account.Drag those emails to the newly connected mailbox’s Draft folder.If the folder appears and has items, select each pending email (ctrl+click each item, or select the top item, then shift+click the bottom item). ![]() Check the Outbox folder (This folder will appear at the top of your folder hierarchy only if you have items contained in it):.This behavior will typically present as items “hanging” in the disconnected mailbox’s Outbox folder. ![]() This may occur when your account completes its migration to Exchange Online, but a reply or message was sent from a now disconnected Outlook session. If your mailbox is disconnected, check your Outbox and Draft folders to ensure no items were created while the account was disconnected. Disconnected Mailbox's Outbox Folder Contains Items ![]()
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