Collaboration software :( Help

[Sam_UK420]

Hi everyone,
I am currently researching collaboration software for my company however I am having some trouble. I cannot seem to find and software that explicitly meets the set requirements:

Site management:
• define the site structure / create our own navigation
• have purely HTML text/image (non-document) pages that we can edit, e.g. for intro sections
• manage user accounts
• create user groups with differing permissions
• upload documents, e.g. MS Office files, PDFs, Flash files (demos), HTML prototypes
Once logged in:
• comment on documents
• download documents in native format
• export comments
Ease of browsing / searching
• effective search
Workflow management
• assign projects to people
• assign tasks to people, e.g. ticketing
• set status on a page, document, thread or ticket
Non-functional requirements
• Secure
• Available / reliable
• Usable
• Easy to maintain
• Regular backups
• Need to host internally so documents stored on our servers

I have found that 'Intranet' software like interact4 and bitrix generally meets the requirements, however as intranets I believe the cost and scale of the software would be excessive seeing as only 25-35 people will be using the software.
The original plan was to use a product called Cyn.in however our IT department (including me :P) is lacking in knowledge of Linux based operating systems; which also means that the software we choose should be windows based.

Please if someone could suggest something that would be useful it would be much appreciated.

Sam x

[Embolism]

Given the scale of your company with 35 employees and your desire to keep the costing down have you not sought out an open source based enterprise solution.
When microsoft looks to make new operating systems they look in the first place to open source for inspiration as all of thier applications are developed originally at source.
I am sure that if you look for a buisness solution within your budget from red hat or fedora or even from sourceforge itself you can get what you want at little cost to your company in respect of the vast costs implemented by windows in such respects.
France has for years now been linux in all its schools and goverment by virtue of licencing costs imposed by windows and its inherent spyware so recommend that you seek some advice from fedora team /red hat teams in such respect.
Most of the worlds servers are still linux based and your systems would cost you less and be more secure using linux based programming.
Even for complete noobs linux ,both fedora and red hat are very simplistic and straight forward in the implementation and not as they used to be 10 years ago when they were more a developers play thing, if my 13 yr old can use it from the age of 7 upwards I am sure an adult can also as its mostly plug and play and click and point these days,so advise you not to dismiss the option and savings of 1000`s in revenue as linux is rock solid ,with secure systems and regular updates and 100000`s of free open source applications,everything windows costs in yearly licences ad infinitum.
I concur that Cynapse (cyn.in) would be an ideal investment for your requirements.