Hi Carolyn,
Yes - that works.
You could actually host all on the one citrix server if you wanted - with a seperate dynamics.set file for the UK users that includes the VAT Daybooks product...if you wanted to seperate this out.
But...technically - there is no issue with the UK users logging into a US company and vice versa. The date issue is only a display thing - its stored in SQL format in tables anyway. The VAT Daybook isn't an issue eithre - you will need to install it (which means all companies would have access to it) - but just enable if for the UK companies...but you could let the US users use a dynamics.set file with the VAT Daybooks product listed in it. Wouldn't be an issue.
The solution you outline will work fine...except if a US user needs to log ino a UK company and run VAT reports.
However there is no technical reason why you can't standardise the GP application for all users.
Best regards,
Ian.