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I like Google Apps for sharing documents in our office, but I've been a Microsoft Office person for so long that I'd have a difficult time giving up Word and Excel. There are some formatting tasks that are just quicker and easier (more granular control?) to perform in Excel. While I dislike Microsoft's changes to Word 2007 and Word 2010, I still find myself using Microsoft Word to create documents which I share with coworkers through Google Apps.
I haven't run into any user account issues, as everyone in our company has their own computer. The tricker thing is that I use Google all day long, and sometimes have to flip between my personal gmail account and my business gmail.