Is it possible to import data from other software such as Quick Books or Express Invoice?
Depends what you are trying to import. You can import list of customers, suppliers, inventory items.
If you are asking if Manager can import Quickbooks file as it is, then the answer is no.
are there plans to be able to import quickbook files
There are many Quickbooks editions and many versions. There might be companies who might offer such conversion but I doubt there will ever be fully automated tool but one never knows.
More than happy to prepare data for import. Are there any documentation on what is needed and how to import?
This will be interesting. I have some clients with Quickbooks data files around 3Gb.
Used to data transfer for large scale ERPs (e.g. SAP etc). Hardest part is mapping output of one system to input into another. Need documentation which seems to be lacking with Manager. Many tools available these days so actual conversion is not the bottleneck.