Help Desk solutions for medium sized business

I've read some of the emails about suggestions for help desk software, but they seem to be mostly for larger organizations.  We are a local government with 2 domains, and about 200 users.  We are looking for a help desk solution.  We don't need a lot of bells and whistles.  Mostly just logging service calls, assigning them, etc.  We would like something that users can enter a call themselves, and a mobile app would be great.  AD integration would be a must also.  

Anyone have any suggestions?
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Did you see this one?

I have been using smartertrack for myself for a long time.  Prior to moving to google apps, I also used to use smartermail and smarter stats is a very nice web stats package.

There is a free trial.  The only downside, is the knowledge base has never been that great.  I have used other large sites that use smartertrack and never had much luck with the knowledge base but that is probably based more on the people setting it up.

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TOHITAuthor Commented:
Thanks for the reply.  Did you go with the online version, or in-house?  I think we'd prefer to keep it in house, linked with our AD.
Thank you much.   : )

Sorry I didn't reply to your last question, I didn't seem to get a notif for it.
I haven't use the program myself, I just remember seeing that question about the same time as you posted yours, on the subject.
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