Is your mymicros data hosted or do you have it onsite on a server? If it is hosted, then you may be out of luck. You could create a list of transactions with their totals and copy that into excel, or even a menu item report. If you have mymicros onsite on a server, i may be able to help (assuming that the database is in SQL)
I haven't pulled data straight out of 3700 in a long time, so i would have to spend time refreshing myself in that area.