Need a program for scheduling clients

Modified this one time Google Calendar. You and colleagues "share" this schedule, and import yourself in iCal and SMS to alert about a scheduled meeting. Although you can use other system of control and accounting of personal time — the desktop options. The same iCal (although it is under Mac OS). I think your customers will be pleased to see on your website-the business card is constantly updated calendar wizard(s) to find a convenient time.

you can try to use microsoft products or OO

And it is possible a counter question?
Comfortable to be in the service station to use the web service?
Are there any technical or moral obstacles?
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I ask without any ulterior motive, just an interesting perspective from your position.

Google calendar / Microsoft CRM

Try Feng Office, it's free, though Web-based, you can put on localhost.
All adjusted for bolumu account under you. There is a Russian localization. It is possible to connect clients and give them access.
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Try zabroniruy.com
a few large a HUNDRED and successfully used. If you want to see examples or have questions, happy to answer.

View ASTAR car service (http://astar.lt)
There is vstroennyy planner, just like you need