Cannot consistently drag and drop .msg files into Outlook 2010

KeGo

New Member
Outlook version
Outlook 2010 64 bit
Email Account
Exchange Server
I have a large set of .msg files created by another user, which I need to import into my Outlook. The majority load normally. Some (around 5%) fail with the message:

"Cannot copy the items. Cannot open file : < file >. The file may not exist, you may not have permission to open it, or it may be open in another program. Right click the folder that contains the file and then click Properties to check your permissions for the folder."

I can open every offending .msg file from explorer by double clicking it, even if I can't drag it into outlook. There appears to some sort of lock on those files but I don't how to tell Outlook to load them anyway.

I have tried: -outlook in safe mode - outlook with all add-ins disabled
 
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