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I am migrating “On My Computer” folders from Legacy Outlook for Mac to New Outlook. Legacy contains approximately 225,999 messages (~56 GB) and the complete folder hierarchy is intact. New Outlook creates the correct folder hierarchy and almost immediately reports that 225,999 messages were successfully imported, but all imported folders are empty and none of the messages can be found using Search. There is approximately 278 GB of free disk space. New Outlook then asks me to remove the Legacy folders because it considers the migration successful. I have NOT removed the Legacy data. I also have an OLM backup. How can I get my actual emails transferred succesfully?
Using the New Outlook for Mac features in business environments
The migration doesn't work. Then I moved manually my folders to the exchange outlook version and this worked but only partially. Many folders when moved appeared empty - some others moved fine.
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Do you notice any difference between the folder that worked and not worked? Like the size of the folder.
If you said you moved it to Exchange Outlook, it might take sometime to sync from Legacy Outlook to the server, then from the server to New Outlook.
Not really. It was somehow random.
Since the behavior appears to be inconsistent, please try moving the empty folder again. If possible, consider moving the folders in smaller batches, or even one folder at a time. This may help reduce the number of processes being executed at the same time.
Just to confirm, in New Outlook, do the migrated folders appear under On My Computer but remain empty, and are all folders affected or only some of them?Since the emails are still accessible in Legacy Outlook and you have an OLM backup, you may try:
Before proceeding, please keep both the original Legacy Outlook data and the OLM backup unchanged so that you have a recovery path if the migration does not complete as expected.
If you choose to re-import the OLM file into Legacy Outlook, please note that this will typically create a second folder hierarchy under On My Computer (for example, an additional "OMC OLM" folder tree alongside your existing folders).
If the import completes successfully and all messages are present, you may manually move or copy folders from the imported OLM hierarchy into the main On My Computer folder hierarchy.
If the migration continues to produce the same result after retrying, another workaround to consider would be:
Disclaimer: Microsoft does not provide, support, or guarantee third-party OLM-to-PST conversion tools. Any such tool should be thoroughly evaluated by your organization before use. Please ensure that you fully understand the risks before using any third-party tool.