Microsoft Office 2011
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Full user review
"Most stable release to-date"
More robust and intuitive user interface
The UI is requiring that I put something here, apparently. So, there ya have it.
Having used Microsoft Office on a Mac for many years, this version is, by far, the most stable.
In 10.6-8, no bugs experienced, and I use Word, specifically, very heavily. Updates and fixes are frequent.
This version of Microsoft Office for Mac is the most compatible release for Mac.