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Yammer Extended Outage. Update: It's Back!
Oct 21, 2009
Nik Cubrilovic
<a href="http://www.crunchbase.com/company/yammer"><img src="http://tctechcrunch.files.wordpress.com/2009/10/cp_1256118449_24256v1-max-250x250-215x43.png" width="215" height="43" /></a> <a href="http: