After update to 16.73 Outlook for Mac, Yahoo mail keeps re-syncing and reloading. Changes made in Outlook AND Yahoo are not syncing.

HI - having same exact problem as everyone else with my Pop3 Yahoo email account (for Epix.net) in Office 365 for the MAC all going away then a short time later all mailboxes downloading again . Spent many hours doing PD, keeping Outlook offline to get something done and finally surrendering to Apple Mail for now. Even tried restoring Outlook back to when this didn't happen via Time Machine but all this does is bring down the current version of Outlook (16.73). This has been going on for about 5-6 days now. My email is a mess now.

Is there a way of rolling backOutlook 365 to a prior version? Thanks

I'm having the same issue, however I am on a slightly older version of Outlook. Have NOT updated to 16.73 yet, so I don't think this is a Microsoft update issue. I feel like it is a Yahoo thing. This started for me either late on May 18, or early May 19. Everything was working fine until then and I've made no changes/updates to my computer or to Outlook. I saw posts in another forum on reddit and seems like this started for those folks in the last week as well.

I have both AOL and Yahoo accounts and initially it was just the AOL account affected. However, this morning I noted that my Yahoo account is now exhibiting the same behavior. (AOL is actually a Yahoo-based email account so this makes sense.) I also have a third account that is through our Exchange server at work and it appears to be ok in Outlook, so that points to it being a Yahoo issue as well. I spoke to AOL support on Saturday and their only suggestion was to use webmail or their app to get my email. I told them that wasn't acceptable since Outlook is the business standard for email and their service should be compatible. They just kept blaming my computer and Outlook as being the problem and wanted me to jump through all the usual hoops.

I was also receiving the messages about the Drafts, Junk, Sent etc. folders not being able to be created because they already existed. This would happen each time it was downloading my email box. I checked the Advanced/Folder settings in Outlook for the account and they were not matching up to what was showing in webmail for the account. (Some of these folders were also located within the list of folders/subfolders I have created to store my emails in the sidebar of webmail rather than appearing at the top of the list with the other AOL default folders.) I changed the Outlook folder settings to map the folders to what was in webmail and now I don't receive those error messages, but it is still continually downloading my inbox and all my other folders/subfolders.

For most of Sunday it appeared to be working as usual, but right before I got ready to go to bed, it started up again. One other thing I did try was to go into the Advanced Settings for the account in Outlook and uncheck the IMAP idle settings and restarted Outlook. I can't remember now, because I was fighting it all weekend, but that may have been when it was working normally. I know I did turn those settings back on at one point. (If you do turn them off, you may have to hit the Send/Receive button to get new mail.)

I use Mail on my iPhone and everything seems to be working as expected for these same accounts there.

I really think Yahoo has done something to change their folder structure that is causing Outlook to have problems.

If anyone does figure this out, please post your solution back here for the rest of us and I will do the same.

Thanks!

Thanks for your post. I hadn't even considered the problem might be unrelated to the updated Outlook version 16.73.

Anyone have any ideas on where to go next, if the problem isn't with Outlook, but with Yahoo email accounts?

If all this disappearing of Yahoo emails (not the folders) and Yahoo downloading the mail again and/or reinstalling Yahoo in your Outlook 365 account for the MAC has resulted in duplicate mail folders - try this to get rid of the duplicates.

With your Outlook open but offline go into Outlook Settings, click accounts and delete the Yahoo account (in my case Epix.net). When done, click add a new account and add your Yahoo account back in. That should get rid if the duplicates but not the initial problem of the disappearing/reappearing Yahoo emails.

Another FYI. Outlook on my Windows 10 machine, which includes the same Yahoo account, Outlook/Yahoo works just fine.

FYI, I use IMAP. Didn't know if POP3 was a problem too.