Hmmm...not sure it's the best, but I use QB's Customer Manager
It's a little more user friendly then say ACT (which I've also used)
It's a little more limited too if you go in deep, but ACTs harder to figure out and use so it's a trade-off
It does NOT work with Quickbooks... Microsoft has Small Business Accounting Software that is almost identical to QB... Currently the MS software will not do the things that QB Premier will do like inventory...
I have used a bit of Canadian software BS1 http://www.dbsonline.com for years now. Had a go with QB but there was too many bells & whistles, and too expensive. BS1 works well, has inventory, and the "Professional" version does time-billing so I can track and bill job/hours.
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