Blackberry server alternative (open source)

Hi guys,

I'm wondering if there's any Blackberry Server alternative, a cheaper solution or Open Source.
I've been reading about Funambol, but it's not totally free.

My idea is to offer to my clients (small/medium businesses) an affordable alternative to expend thousands in Windows and blackberry server licenses.

Thank you.
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If you do not use more than 30 licenses you can use Blackberry express:

1 license is included in the free download

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Funambol is free, but  then not supported. But important is not only what are the cost of a solution, but also the savings. With BlackBerry Professional Software (see post Kurt) installed on a Microsoft Small Business server the costs are not that big...

champoteAuthor Commented:
Thanks for the info! I'll check that Blackbery Express and see how it works.
However, what I'm trying to do is putting together a product without having to be worried about licenses, reducing the cost at maximum to my clients (small businesses).
Funambol apparently is no 100% free, there are mothly fees depending on the number of users.
A good think about Funambol is that you can synch other devices than Blackberry, pretty much any PDA.
Gary CutriData & Communications SpecialistCommented:
As you stated you are looking at "reducing the cost at maximum to my clients" but you need to ensure you don't put that above reliability, usability and ease of support.  Every site that know that uses open source software struggles to get any support from other mainstream applications (which they always need at some point), and they end up in a support nightmare (e.g. You have an issue with a BlackBerry and you call your service provider for support, then you mention Open Source Software and they will hang up on you).  
Forced accept.

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