When you click on your gmail address in the Outlook navigation pane, you will see a subfolder named 'Gmail'. Instead, you will see it in the Gmail hierarchy. Select Ok to automatically archive messages for the selected folder and date-range. Email sent from Outlook through your Gmail account is not saved in Outlooks Sent folder. Select your Inbox folder that you want to archive, set a date range to archive messages for and select the new data file you created. However, if you are sure the above is not the case, then try. You can also use the auto-archiving features in Outlook by going to the File menu and selecting Tools, then selecting Clean Up Old Items. So remember, if you have a lot of emails or/and a slow internet connection, sync may take a while.

Right-click on the folder heading to add sub-folders to copy your mail items to.

You should see now that a new folder location has been added in the folders pane in Outlook under your normal inbox and sent items.

Enter a file-name for the data file and select a location if required then select Ok to create the new data file.

Select Add to create a new data file (.pst file).

Go to the tab within the account settings menu for Data Files.

Follow the steps below to create a new local data file…

The following guide will explain how to create a local archive in Outlook 2019 if you are using an earlier version look below this tutorial. Check the Include the selected account in this group box. This will free up lots of space within your mailbox without permanently deleting those old emails and can even speed up your email systems synchronisation with the email server. If you are having problems where the contents of IMAP folders in Outlook do not sync then please follow the directions below. It appears correct in Outlook365 but can't be seen in webmail. I've established that if I move a folder then it's not likely to sync.

When I have to re-add my email accounts (rebuild, migration etc.) it manifests by missing folders/emails. If your IMAP mailbox is full or is approaching the your storage limit for your account, you can simply archive messages by copying them to an offline location on your computer, sounds a bit tricky, but its quite easy and only takes a few minutes to set it up. I've been suffering with what I now believe are IMAP folder sync issues for years.

Imap folders not syncing outlook 2019