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Chaikenj, I'm guessing you are using a USB adapter (micro male to standard female) as I haven't seen a mouse that has a micro USB connector (though I am sure it is out there). If so, that USB adapter needs to be OTG, like garryknight mentioned. If it isn't it will not work with anything you connect.
This one will work, it's only 14 centshttp://www.amazon.com/Micro-Adapter-Compatible-Google-Nexus/dp/B008MI79HO/ref=sr_1_5?s=electronics&ie=UTF8&qid=1343760935&sr=1-5&keywords=micro+usb+adapter+nexus+7
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