I was told that after online maintenance, some deleted space will be turned into Whitespace and Exchange will then use the Whitespace first and then start to expand the EDB file size when there is no more whitespace to use.
But my observation supports our Exchange seems to skip using Whitespace and simply jump in to expand EDB file for use. Here is what I did:
Two days ago I moved a big mailbox of 11GB out of mdb1. With maintenance running every night I expect at least some of 11GB should turn into Whitespace if not all so the "AvailableNewMailboxSpace" should reflect the increase of whitespace. As the matter of fact, I saw the EDB file size only keeps increasing from 94G to 98G within two days. I'm wondering if the free space is never transferred into Whitespace or our Exchange doesn't use Whitespace at all. How to fix this issue? Please help.