When my town made the decision to switch, it was a comparison between google and a standard exchange upgrade. I don't believe 365 was even considered. The decision, like so many things now, was...
Windows XP Support ToolsCommented on: 9 years ago
(May 27, 2005)
OH.EXE is not included in the XP support tools installation. You much get it from the server support tools, or as an individual download from M$.
* Deploying, Managing, and Maintaining Windows * Key Features of Active Directory from Windows 2000 to Windows Server 2012 * Key elements of System Center 2012 and System Center 2012 R2 * Deploying, Migrating to and Managing Hyper-V in Your Organization * Implementing a Private Cloud * Using PowerShell to Automate Common Tasks