Windows Small Business Server 2008: Support and Troubleshooting

I have even tried three seperate hard disks in case there was a
problem, now I 'm just lost!!

Does anyone have any thoughts please?

[tfl - 09 04 09] You should post questions like this to the Technet Forums at http://forums.microsoft.com/technet or the MS Newsgroups at http://www.microsoft.com/communities/newsgroups/en-us/. You are much more likely get a quick response using the forums than through the Community Content.
For specific help about:
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SQL Server     :  http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.sqlserver%2C&
Windows        :  http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.windows%2C&
Windows Server :  http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.windows.server%2C&
Virtual Server :  http://groups.google.com/group/microsoft.public.virtualserver/topics?lnk
Full Public    :  http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public%2C&

We have install two brand new sbs 2008 servers for two different customers and we have the same problem :

We have configured two usb disks with the backup wizzard and performed the first backup with the first one. Next day we have exchange the disk with the other (in safe unplugging the first one) and the backup is ok too. But the following days the servers don't succeed all days to perform the backup. The report says that there isn't active disk, but there is ! And the consequence is a very slow server with an inaccessible exchange. Only reboot can make the servers accessible again.

We use Western Digital Passport USB Disk Drive 2.5".

[tfl - 09 04 09] You should post questions like this to the Technet Forums at http://forums.microsoft.com/technet or the MS Newsgroups at http://www.microsoft.com/communities/newsgroups/en-us/. You are much more likely get a quick response using the forums than through the Community Content.
For specific help about:
Exchange : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.exchange%2C&
SQL Server : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.sqlserver%2C&
Windows : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.windows%2C&
Windows Server : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.windows.server%2C&
Virtual Server : http://groups.google.com/group/microsoft.public.virtualserver/topics?lnk
Full Public : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public%2C&

this is the error message I get when joining some XP pro machines to my new SBS2008 domain. Any work arounds?

[tfl - 09 04 09] You should post questions like this to the Technet Forums at http://forums.microsoft.com/technet or the MS Newsgroups at http://www.microsoft.com/communities/newsgroups/en-us/. You are much more likely get a quick response using the forums than through the Community Content.
For specific help about:
Exchange : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.exchange%2C&
SQL Server : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.sqlserver%2C&
Windows : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.windows%2C&
Windows Server : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public.windows.server%2C&
Virtual Server : http://groups.google.com/group/microsoft.public.virtualserver/topics?lnk
Full Public : http://groups.google.com/groups/dir?sel=usenet%3Dmicrosoft.public%2C&