While upgrading Exchange 2013 to the new SP1, the installer reaches step 3, "Copying Exchange Files", sits at 0% for 10-15 minutes and then when without warning the machine will reboot.
The last couple logs from ExchangeSetup.log are:
[02/28/2014 00:16:58.0878] [1] Installing MSI package 'C:\Exchange2013SP1\exchangeserver.msi'.
[02/28/2014 00:16:58.0878] [1] No updates directory was specified for the msi installation.
[02/28/2014 00:16:58.0878] [1] Installing a new product. Package: C:\Exchange2013SP1\exchangeserver.msi. Property values: DISABLEERRORREPORTING=1 PRODUCTLANGUAGELCID=1033 DEFAULTLANGUAGENAME=ENU DEFAULTLANGUAGELCID=1033 INSTALLCOMMENT="Installed language
for this product: English (United States)" REBOOT=ReallySuppress TARGETDIR="C:\Program Files\Microsoft\Exchange Server\V15" ADDLOCAL=Bridgehead,FrontendTransport,ClientAccess,UnifiedMessaging,Mailbox,AdminTools,Cafe,AdminToolsNonGateway