The Microsoft-Google tit-for-tat spat over Apps Sync accents the new battleground over which the companies are fighting. Google has moved onto sacred Microsoft territory: Office. Google’s synchronization approach is simply brilliant, and Microsoft executives should cower in fear.

Quick recap: A week ago, Google unveiled Apps Sync, which lets Outlook users connect to GAPE, Google Apps Premiere Edition. Rather than an Exchange Server, Outlook connects to Google’s cloud services. Today, Microsoft took the offensive on this incursion into its territory with a blog post detailing two problems caused by the Apps Sync plugin. I’ll get to the specifics of the problems in a few paragraphs.