It’s definitely been a while. So recently at my Job we’ve had some issues with the OST file limit. We have plent of people here that access shared resources and with their own mailbox being large need to have more thatn 20GB stored in their OST.
To increase the OST size you can do a simple registry change (I believe the example below sets it to 50GB). Create a .reg file and drop this in and then launch it:
Here is a link to the article that tells you about changing the file size limit.