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Migrated IMAP email account to Microsoft 365 and can't see sub folders in iOS devices or Outlook App for iOS.

I migrated a user from an IMAP email account by exporting all information to a .pst file using Outlook 2016.  I verified that all folders and email in fact were exported.  I then imported the data into a newly created Microsoft 365 email account using Outlook 2016. All folders and files imported perfectly and the Microsoft 365 account began synchronizing the data perfectly.  I logged onto the Microsoft 365 web interface and found all of the folders to be there.
I then began to setup access to my Microsoft 365 account.  It authenticated, and began synchronizing. However, all user created folders (User created folders, except inbox, sent, deleted, etc) are not visible on an iPad / iPhone.  I've confirmed this on multiple devices.  If I create a new folder in Outlook 2016, it is visible, but the preexisting folders are not.  Any thoughts would be greatly appreciated.

Is there some type of formatting issue when exporting IMAP folders that prevents the iOS device to not see it?
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jesusperez70
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jesusperez70
1 Solution
 
ZENandEmailguyCommented:
I saw this happen after importing PST data into several Office 365 accounts.  You'd click on a folder and there would be a message "there are no items to show...".  Folders also didn't appear (and this was in Outlook client, and OWA.  We didn't try tablets or phones).

The fix was a change in default view of Outlook.  I knew all of the data was there because advanced properties on a given folder told me the message count.

Here are a couple of blogs I found doing a quick search:
https://www.msoutlook.info/question/840
http://www.slipstick.com/developer/code-samples/change-outlook-folder-type-export/

Once I changed the default view, all was well.

Scott
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jesusperez70Author Commented:
The second link did the trick.  What happens is that the exported folders continue to have IMAP properties.  In order for those folders to be visible on an iOS device, the properties need to be changed.  The second macro script did the trick.
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