Currently, I am having Exchange Migration and facing issue with size increase. I have gone through "https://technet.microsoft.com/en-us/library/jj150489(v=exchg.150).aspx#Mailbox" but could not found resolution. A 900 MB mailbox on Exchange 2010 is become around 1200 MB on Exchange 2013. I understand calculation of property and other stuff, However My Query is if it happned to all mailbox then Database size will increased on Exchange 2013 too a lot in comparison of Exchange 2010 as I have to migrate 1000 users to Exchange 2013. What should I do to avoid the disk space issue ? as I have almost same size on Ex 2013/ Ex 2010 for database.
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