what exactly is the users Dumpster? Is it something that could be missed should i clear it?

I had this question after viewing Emails bouncing back from Calendar updates but nothing else. Exchange 2013.
I have another question open. I have an issue with someone not able to receive calendar updates. The sender gets a bounce back stating the mailbox is full even though it is not the biggest mailbox in our company and ordinary mail goes through fine. I did notice I get dumpster size errors when I try and move her mailbox to another database. I have suggestions, I just want to be sure clearing the dumpster will not cause other issues
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AmitIT ArchitectCommented:
Check if mailbox is on legal hold. That could hit the dumpster limit. Disable legal hold.

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