Hi @Michael Adams ,
Have you tried to create a new Outlook profile and then set cache level to all?
Does it then get all emails?
I have a user with 99 GB in their Outlook 365 account. I need to archive emails older than five years old to a PST file. I can't do it. Even when I set the cache level in the Outlook desktop app to "All", I only get a year's worth of emails.
If you try to run Outlook without "Cached Mode" on, I get all of the emails showing. However, if I click on "Clean Up Old Items", it gives an error message "The attempted operation failed. An object could not be found."
I did find a document that says to change some registry entries to allow Outlook to cache more emails.
However, the maximum file size in this document is 50 GB. The user has an account of 99 GB. The maximum number of months can be increased to 60 months. I need 120 months.
Any ideas to get past these limits would be appreciated.