I'd like some advice to point me towards the most favourable option for upgrading my SBS 2003 server.
It is running on a 32-bit HP Proliant machine that has 4gb of ram, an INtel Xeon(firstname.lastname@example.orgGhz) CPU, and 1TB of HD space.
It currently supports 20 users. It is possible that we may expand to 25 users in the near future.
The office has about 7 Windows xp machines, 7 Windows 7 machines, and 3 Windows 8(not all of the windows 8 machines are joined to the domain).
The server runs Exchange 2003, extended support for which expires this coming April. The server 2003 component expires in July 2015(i think).
I should mention that we have a proprietary booking reservation system that is currently stable on Access 2000 only. This works on the xp and 7 workstations but has not yet been tested on the Windows 8 machines(it's on my todo list)
There are 2-6 employees who work remotely through a vpn. At least 2 of these need to remotely log on to their machines in order to use the reservation system.
I would appreciate any suggestions you have. I am a bit baffled by my options.