SharePoint 2010 Check-Out Issue

I have an Internet (External) user with Windows Vista and (now) IE 9 with Office 2007 on her personal computer (not a member of the Domain).  She has sufficient access to get to a specific SharePoint site we have in-house, and she has Full Control of a specific Excel document we posted in Shared Document Library.  The site in IE is set as a Trusted Site and she can log in using her Domain credentials without a problem.  

However, when she attempts to Check Out, she receives the following error: "This document could not be checked out.  You may not have permission to check out the document or it is already checked out or locked for editing by another user.".  If she tries to use Edit in Microsoft Excel, she receives: "The document could not be opened for editing.  A Microsoft SharePoint Foundation compatible application could not be found to edit the document.".

It can't be a site permissions issue because I can take my Windows 7 laptop, connect to the SharePoint server from the outside Internet, log in as her and Check Out the same document, Edit it in Excel 2010, Save, then Check In.  My laptop is also intentionally not a member of the Domain so I can test issues like this for our outside Engineers.

What could be preventing the ability for her to Check Out on her (personal) computer?
Wade_ChestnutAsked:
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jessc7Connect With a Mentor Commented:
Well, in that case there is no root site collection. It would show as: /

Could you temporarily make a new site collection at the root? I know it seems unrelated, but I've seen similar behavior in another environment. I'm wondering if Office 2010 (your test laptop) handles that scenario better.
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jessc7Commented:
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Wade_ChestnutAuthor Commented:
I believe so.  Under Site Collection List in Central Administration, there are 3 listed: /my, /sites/APT and /sites/DataField.  The document in question is located in a sub-site off of the 3rd one:

.../sites/DataField/ClientA/Invoicing/Forms/AllItems.aspx

Besides, this is only happening on her computer -- no one else's.
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Wade_ChestnutAuthor Commented:
Okay, I created the / collection and asked the user to try to Check Out the document again.  I probably won't hear from here until Monday.  I'll keep you posted.
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Wade_ChestnutAuthor Commented:
WOW!  It worked!  That's kind of surprising since that change wasn't necessarily security related or even directly related to the sub-sites.... interesting.  And maybe Office 2010 does handle it better with it being more integrated with SharePoint.

THANK YOU VERY MUCH!!
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jessc7Commented:
Yeah it's a weird one, that's for sure! I know you would question doing it, but I had seen it before. I'm wondering if a web service call is involved, and with earlier versions of Office it goes to the root site collection by default for the call, and they changed it in Office 2010 to use the current web. Just a guess, I really don't know.

Glad it worked!
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