Here are currently available executive summaries of Osterman Research multiclient reports, all available at no charge.
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2012
Cloud Messaging Market Trends, 2011-2014
Published January 2012

2011
Messaging and Web Security Market Trends, 2011-2014
Published November 2011

Content Archiving Market Trends, 2011-2014
Published September 2011

Messaging in the SMB Market, 2010-2013
Published August 2011

Messaging Policy Market Trends, 2010-2013
Published July 2011

Mobile Messaging Market Trends, 2010-2013
Published May 2011

Unified Communications Market Trends, 2010-2013
Published May 2011

Messaging Server Market Trends, 2010-2013
Published January 2011

2010
SaaS Messaging Market Trends, 2010-2013
Published November 2010

Messaging and Web Security Market Trends, 2010-2013
Published August 2010

Content Archiving Market Trends, 2010-2013
Published July 2010

Messaging Policy Market Trends, 2009-2012
Published June 2010

Messaging in the SMB Market, 2009-2012
Published March 2010

2009
SaaS Messaging Market Trends, 2009-2012
Published September 2009

Mobile Messaging Market Trends, 2009-2012
Published July 2009

Unified Communications Market Trends, 2009-2012
Published June 2009

Email, Web and IM Security Market Trends, 2009-2012
Published June 2009

Messaging Archiving Market Trends, 2009-2012
Published May 2009

Enterprise Messaging Server Market Trends, 2008-2011
Published March 2009

Messaging in the SMB Market, 2008-2011
Published February 2009

Enterprise VoIP Market Trends, 2009-2012
Published February 2009

2008
Presence, IM and Real-Time Communication Trends, 2008-2011
Published September 2008
  
Hosted Messaging Market Trends, 2008-2011
Published July 2008

Unified Messaging Market Trends, 2008-2011
Published June 2008

Email, Web and IM Security Market Trends, 2008-2011
Published May 2008
  
Messaging Archiving and Document Managment Market Trends, 2008-2011
Published April 2008
  
Messaging Virtualization Market Trends, 2008-2011
Published March 2008
  
The UK Messaging Market, 2008-2011
Published March 2008
  
Enterprise VoIP Market Trends, 2008-2011
Published February 2008
  
2007
Enterprise Messaging Server Trends, 2007-2010
Published November 2007
  
Messaging in the SMB Market, 2007-2010
Published October 2007
  
Mobile Messaging Market Trends, 2007-2010
Published October 2007
  
Hosted Messaging Market Trends, 2007-2010
Published August 2007
  
Messaging Policy Management Trends, 2007-2010
Published July 2007
  
Messaging, Web and IM Security Market Trends, 2007-2010
Published May 2007
  
Unified Messaging Market Trends, 2007-2010
Published April 2007
  
Messaging Archiving Market Trends, 2007-2010
Published April 2007
  
Unified Messaging Market Trends, 2007-2010
Published April 2007
  
2006
Messaging in the SMB Market, 2006-2009
Published November 2006
  
Messaging Policy Management Trends, 2006-2009
Published September 2006
  
Mobile Messaging Market Trends, 2006-2009
Published September 2006
  
Hosted Messaging Market Trends, 2006-2009
Published August 2006
  
Messaging Security Market Trends, 2006-2009
Published July 2006
  
Communications in the Healthcare Industry, 2006-2009
Published July 2006
  
Enterprise Instant Messaging and Presence Trends, 2006-2009
Published May 2006
  
Messaging Archiving Market Trends, 2006-2009
Published March 2006
  
2005
Enterprise VoIP Market Trends, 2006-2009
Published January 2006
  
The UK Messaging Market, 2006-2009
Published December 2005
  
Enterprise Messaging Market Trends, 2005-2008
Published December 2005
  
Hosted Messaging Market Trends, 2005-2008
Published August 2005
  
Messaging in the SMB Market, 2005-2008
Published July 2005
  
Messaging Security Market Trends, 2005-2008
Published July 2005
  
Enterprise Instant Messaging Trends, 2005-2008
Published June 2005
  
Messaging Archiving Market Trends, 2005-2008
Published April 2005
  
Enterprise VoIP Market Trends, 2004-2007
Published February 2005
  
2004
Enterprise Messaging System Trends, 2004-2007
Published November 2004
  
Email and IM Security Market Trends, 2004-2007
Published August 2004
  
Email Archiving Market Trends, 2004-2007
Published June 2004
  
Enterprise Instant Messaging: Problems, Needs and ROI
Published April 2004
  
Enterprise Messaging Systems: Market Problems, Needs and Trends
Published January 2004
  
2003
Enterprise Email Archiving: Market Problems, Needs and Trends
Published September 2003
  
Spam in the Enterprise: Market Problems, Needs and Trends
Published May 2003
  
Instant Messaging: Enterprise Market Needs and Trends
Published February 2003