Originally Posted by dbuckho
One software as service company I know of is HyperOffice. Back in the Internet boom they were trying to be an MS-Office competitor; after the bust they settled in and found a niche serving small companies and organizations without a technical staff -- similar to how you describe your organization.
http://www.hyperoffice.com/
They have some case studies on their non-profit clients:
http://www.hyperoffice.com/hypermain/non_profit.cfm
A disclaimer - I know one of the principals in the company. But as an IT executive with a large company who looks at software for a living, I can also tell you that their suite is quite nice. Pricing is published on their website; non-profits get a discount.
Might work for some (and apparently so because they assure me they have thousands of happy customers), but HyperOffice was pretty much a disaster for us. We had 50-60 users on it, and they couldn't fix various basic problems that affected us (garbled text in outgoing email in their own web client interface, for example). And it's a very difficult product to migrate out of except on a user-by-user basis. Might be fine for a few users, and might be more fine if you use their Outlook connector which bypasses any problems in their own client. But their web client interface is pretty tired. Plus, more importantly, support was slow.
We just migrated to a dedicated server running Zimbra (the paid version) using partner managed hosting company Contegix. So far, so much better. Fast and responsive support and up to the minute web client interface. This costs us about 3x as much on a monthly basis, though. Apparently that's where we need to be to get the right service.