You can get peachtree or microsoft's version of business software to convert to it, then you can download the quickbooks conversion tool to turn it back into quickbooks.
Converting to another accounting package and then back to QuickBooks again is bound to lose some of your data however because not all other accounting packages support the same types of transactions that QuickBooks does. The conversion tool that brings data back into QuickBooks also uses the QB SDK which also does not support all types of transactions such as payroll. It also will not transfer any online services you may have subscribed to. The best way to convert your data is to seek the assistance of a company that offers a conversion service capable of transferring all of the data without relying on the QB SDK. A search on Google for "convert quickbooks enterprise to pro or premier" will result in a few different options.
QuickBooks provide different options that allow multi-users in a company file at the same time depending on the software version being used. The max. number of simultaneous users for QuickBooks Pro is 3 users while for the Premier Edition is 5 users. The largest multi-user license that can be purchased is for 30 concurrent users on the QuickBooks Enterprise Solutions.
Amazon has the book that you are looking for:
If you have more than 10,000 different inventory items (different items in your list), you may want to use QuickBooks Enterprise Edition.
Standard edition, Enterprise edition, Web edition, Datacentre edition and Web edition.
Note: Yes, standard edition will work with enterprise edition.
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Java Enterprise Edition (Java EE).
5 for Standard edition, 100 for Enterprise
Oracle Business Intelligence Enterprise Edition
DataCenter
yes
J2EE = enterprise edition jdk. J2SE = standard edition jdk. J2ME = mobile edition jdk. standard jdk gets used for platform development, enterprise jdk for enterprise development and mobile jdk gets used for mobile development.