. . . . Regarding a re-download and install of Current MEP . . . .
Because in effect you have a new computer MEP will require re-registering/activating again.
Windows 10 - I would recommend you get Windows 10 Pro you can then control when Windows updates.
. . . . can I access my emails saved to another drive . . . .
If you are using Outlook, yes backup the PST or OST files (depends which mode you are using Outlook).
After re-installing run Outlook, let it create a PST file and the add in other old PST and make it the default.
. . . . I have not really decided on a motherboard as yet . . . .
Make sure you have enough:
- USB ports, my MB has 14 and I have recently added another 7 ports via a USB 3 hub, for slower devices, to bring the total to 21 - I was running out of ports.
- Memory slots for expansion at a later date.
. . . . number of hard drives that can be connected internally . . . .
Most motherboards have at least 6 SATA connectors, however this can be potentially lower if you use a M.2 SSD SATA device - it knocks out at least one, sometimes 2, SATA ports depending on the MB, and take into account the number of SATA DVD/BD burners you have.
If you are considering a SSD for the OS ensure the MB supports NVME /PCIexpress devices in the m.2 slot