A very specific issue but sharing in case it ever helps someone out.
Following on from my forum query https://www-secure.symantec.com/connect/forums/ev9-iis-sites
I was testing an EV9 to EV10 upgrade and roll back, everything went OK apart from the web-sites (no search or archiveexplorer). After some investigation I realised I did not have the EnterpriseVault virtual directory. Lots of re-installs of EV9, uninstall/reinstalls of EV9, removal of IIS etc.. all without success.
JesusWept3 passed across the below helpful tip:
Cd to your EV directory and type cscript webapp.vbs
Looked very promising but kept throwing a "Failed to create Virtual Directory" error. Going through the VBS and realising where it was failing I manually created the IIS virtual directory in IIS Manager and re-ran the VBS, much more promising and he script created the Directory and AppPool.
Still no Search.asp or ArchiveExplorerui.asp access, "Archive Explorer generates error: XML returned for tree view is not as expected (500)" and "The service is not available" errors as in http://www.symantec.com/docs/TECH74846. I followed all of the troubleshooting without success.
I then started comparing the settings against working sites. Noticed that "Enable 32-Bit Applications" was set to "False". I changed it to "True", restarted IIS and everything now works.
Not sure how this happened as my EV9, EV10 and EV11 servers all have this value set to "True".
Thanks to JesusWept3 and AndrewB for the help.
