Mainsoft was founded in 1993, mainly to propose integration products between Windows and other systems.
Mainsoft was one of the main providers for the Microsoft Windows Interface Source Environment (WISE) program, a licensing program from Microsoft which allowed developers to recompile and run Windows-based applications on UNIX and Macintosh platforms. WISE software development kits (SDKs) were not directly provided by Microsoft. Instead Microsoft established partnerships to several software providers which in turn sold WISE SDKs to end-users.
Since then, Mainsoft activity shifted to integration of Microsoft SharePoint into IBM products (IBM Lotus Notes, IBM WebSphere, Rational Jazz) and products focusing on .NET Framework and JavaEE.
According to its LinkedIn profile, Mainsoft Coroporation changed its name to harmon.ie (www.harmon.ie) in 2010. 
Windows source code leak
To be able to develop WISE SDKs, software providers needed to have access to Windows internals source code. In 2004, more than 30000 source files from Windows 2000 and Windows NT 4.0 were leaked to the internet. It was later discovered that the source of the leak originated from Mainsoft.
- Internet Explorer for UNIX
- Grasshopper, a Mainsoft framework to allow the use of VisualBasic and C# applications on a Java Application Server
- "About Mainsoft". mainsoft.com. Retrieved 2009-07-03.
- "Windows Interface Source Environment (WISE)". January 1995. Retrieved 2008-04-26.
- "Windows Source Leak Traces Back to Mainsoft". 2004-02-13. Retrieved 2008-04-26. "Mainsoft extended its WISE agreement with Microsoft in March 2000 to include access to the Windows 2000 source. Microsoft subsequently employed Mainsoft to port Windows Media Player 6.3 and Internet Explorer to Unix."
- "SharePoint Integrator – Product Suite". mainsoft.com. Retrieved 2009-07-03.
- "Mainsoft links Microsoft SharePoint, IBM Jazz". infoworld.com. 2009-03-17. Retrieved 2009-07-03.
- "Sharepoint gets Notes 8.5 integration from Mainsoft". techworld.com.au. 2009-06-17. Retrieved 2009-07-03.
- "Mainsoft (renamed harmon.ie)". Retrieved 2014-01-01.
- "Mainsoft Eyed as Windows Source Code Leak". internetnews.co. 2004-02-13. Retrieved 2009-07-03.
- "Microsoft Updates Code Leak Statement, Mainsoft Fingered". windowsitpro.com. 2004-02-19. Retrieved 2009-07-03.
- Company website
- MainWin, a Mainsoft platform allowing to port Windows applications to Unix and Linux
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