Since Outlook has a limit on how many folders can be synced at a time, there can be a queue of folders waiting. Outlook checks the server for updates every minute, any folder that has updates will subsequently be synced. Due to the design of Outlook's sync engine (and how exchange works), you will see the 512 newest messages in a folder at the initial start of sync then the rest of the folder's contents will be back filled before you see any mail that arrives after this point. Do NOT make subfolders under the Inbox.Īny folder with more than a few thousand messages is going to take some time to fully come down when you first sync your account. (this is the number one cause of problems with sync). The Inbox syncs more frequently than any other and should be kept as clean as possible. She needs to archive messages to subfolders to reduce the number of messages in the Inbox. It's the number of messages in the Inbox that is the problem. Regardless, you will have similar issues with Outlook. If you visit the Microsoft forums, you'll find lots of issues with Outlook 2016. See the important notes above.I support Microsoft Outlook and while it's a more robust Exchange client than Apple Mail, It's also missing a lot of features you get in Mail. If it isn't working for you, you might be turning off the wrong Mail. Make sure to follow the above paths exactly as written. Open Mail and your changes should still be there.> Turn Mail ON (Important: this is NOT the first Mail you see, in the main iCloud window, this is the Mail in the iCloud Drive options window.). System Preferences > iCloud > iCloud Drive > Options.Reopen Mail to check your changes are still there, then quit again.Make the changes to your email signatures.> Turn Mail OFF (Important: this is NOT the first Mail you see, in the main iCloud window, this is the Mail in the iCloud Drive options window). This fixed it for me, in case anyone else googles this issue of disappearing Mail signatures in El Capitan. The issue has still not been fixed by Apple however there is a second workaround if the above steps do not work for you. Thanks to user ttttttttttt who posted this on the Apple forums on May 8, 2017. It looks like Apple are aware of the issue and working on it. This is a known issue with Apple Mail, you can read more about it here. If your email signature won't save or keeps disappearing when you add it to your Mac Mail, there's a fix for this:

Apple mail vs outlook 2017