Our zimbra server is 4.5.7 OSS

and with the huge volumes of email we send and recive, have accumulated approximately 140GB of email in our message store in about 8 months.

my question is. can i move the opt/zimbra/store/ folder to a new linux box with a 750GB hard drive mount the drive in that folder and have everything work? should i expect a large performance hit?

alternatively weve got a 1.4TB file sharing windows server, is there any reason i should avoid moving my message store to a windows based OS?