In answer to your Office 2007 with Vista post tag, Ummmm.. Yeah, that's what the two of them were all about!!! For the last 6 months all there has been is the Vista/2007 hype.
Windows 2003? That's a server OS. Are you running server OSs on desktop machines? Or are you referring to Office 2003, which is an APPLICATION? Windows and Office are two different things, Office CAN'T run without Windows, but Windows is very happy NOT having Office installed.
If the OS is copied to three different machines, YOU ARE running pirated copies of the OS. This is what WGA is all about. If you can't email attachments to your office and have them open, you probably DON'T have the application required to open them, it's as simple as that. The compatibilities have nothing to do with the OS, and LITTLE to do with recent versions of Office, as their documents are (of late) interchangeable between the various versions of Office, with the notable exception of Access.
As far as your boSS not being able to open them, can he not OPEN them, or are they being blocked? BIG difference. If he cannot open them, then the application necessary to open them is not installed on the receiving computer. As far as them being blocked, most Excel files will be blocked by Outlook and Outlook Express, due to the possibility of harmful macros being possible payloads. There are many OTHER types of files that can be blocked as well. .EXE, .XLS, .JPG, .COM... All will be blocked by the security settings.
If they formatted without backing up your files, then your emailbox is gone. You will be searching for a file called "Outlook". If you find it, and you DON'T have Outlook installed, you can't put that information into Outlook Express. You need to install Outlook. Once installed, set it up as you usually would, then copy the OLD Outlook file over the NEW Outlook file. (I actually rename the new one, and copy the old one into the same directory.) Easy.
One last brutal, potentially painful thing... I am amazed you made it... With typing skills and grammar like that, how do you keep a job? Learn how to use a spell check! You post like some of the teenagers at one of the audio electronics forums I frequent, yet you claim a "Legal/Medical Professional" status...
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