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Office 365 Outlook 2016 .OST 50GB Limit
I currently am in the process of building the Outlook Mailboxes on various computers, some of which stop at 9GB,14GB but mainly 49GB (49,000,000kb) on the OST file and say all folders are updated, I ...
The trouble you are having is that outlook and other modern mail apps use some type of encryption and compression. There are limits to the size of the compression and encryption apps. You are limited by math sadly.