The real question you should be asking is, "Do I want to use more than 4GB RAM?" With 32-bit versions of Windows Server you cannot. But with 64-bit versions of the software you can actually use up a lot more than 4GB if you wanted, up to 128GB I think. For the other part of your question about which one is more useful, you will find the 64-bit version more appropriate for newer computers that can take advantage of 64-bit features. For example, the CPU, device drivers, a lot more RAM, etc. Try researching the manufacturer website to get more detailed answers. Overview of the compatibility considerations for 32-bit programs on 64-bit versions of Windows Server 2003 and Windows XP http://support.microsoft.com/kb/896456 A description of the differences between 32-bit versions of Windows Vista and 64-bit versions of Windows Vista http://support.microsoft.com/kb/946765 32-bit and 64-bit Windows: Frequently asked questions http://www.microsoft.com/windows/windows-7/compare/32-bit-64-bit-faq.aspx 32-bit and 64-bit Windows: frequently asked questions http://windows.microsoft.com/en-US/...and-64-bit-Windows-frequently-asked-questions
I agree with awesometbn, most computers and servers can run 64 or 32 bit without many compatibility issues if your software is up to date. Unless you have something that REQUIRES 32 bit. Go w/ 64 so you can upgrade without ram issues.
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It really depends on your server is you have 2gb of ram on your server just go with 32bit, but if you have 32gb or 64gb of ram go with 64bit. There is a lot more to put in consideration so I definitely recommend comparing both to your needs.
One tip for you, there are software that would work for 32 bit or 64 bit bit servers. Always check the specs or you will be sorry if you buy the wrong one.
With 64 some softwares are not compatible . first list on your basic needs and then configure your system .
There are some difference on 64 and 32 bits. Both are working on according to your system, If you have a high configured system then you use the 64 bit. but the system doesn't have a high level configuration then you use a 32 bits. So it totally depends upon your system configuration.
Many drivers, like for instance printers drivers, don't work with 64bits. You should check for compatibility issue before going to 64 bits systems.
concerning a servers purpose you should have more functionality and find all utilities available for 64. On Linux you wont have an issue as 64 can run all 32 bit programs without any issues, Although the only significant issue i found on windows is that flash has an issue on ie 64 bit