[Updated] Released: Exchange Server 2013 Service Pack 1
We have also released the Service Pack 1 for Exchange Server 2013.
You can read the full details at :
Released: Exchange Server 2013 Service Pack 1 - Exchange Team Blog - Site Home - TechNet Blogs
You can get the SP1 from here :
After deploying the SP1 the build number you should observe is : 15.00.0847.