Free/Busy not availiable

I realize this issue has been talked about extensively but none of the solutions have fixed my users.
I have 3 known users that cannot see free/busy information or use out of office. I have approximately 85 Exchange 2010 (Build 218.15) users on Outlook 2007. They can logon to other machines and everything works, others can log onto their machine and everything works. They can also work via OWA.
I have gone through troubleshooting and setup guides for autodiscover and I have cleaned up ExchDelegateListLink (although no effected user were on it). Test email autoconfiguration fails for the specific users but works for all others. If I delete the Outlook profile it will auto create it again correctly but still no F/B.
I am at a standstill.
smdh-isAsked:
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ITPTCommented:
have you tried to delete the local profile for the affected users on the machines they cannot work correctly on? does autoconfiguration work for them on other machines?
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David SankovskySenior SysAdminCommented:
I understand that's a long shot, but did you try completely removing the users and recreating them from scratch? (you can export and import the mailbox to make sure they don't lose anything). when I mean completely removing I mean this:

1. Export a PST of the mailbox

2. Delete the mailbox

3. Backup User membership and any files on the network that belong to him

4. Delete the user from AD

5. Recreate user on AD, restore memberships and recreate mailbox, then import PST into said mailbox

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Will SzymkowskiSenior Solution ArchitectCommented:
As stated this is most like machine or profile specific. Have the other user login to a machine that is working and see if the issue remains.

Will.
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smdh-isAuthor Commented:
ITPT - Have deleted Windows profiles and no they do not work on other machines

David Sankovsky - Yes and it did not fix the issue.
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smdh-isAuthor Commented:
I finally solved the problem....
Turns out the issue was with my Internet explorer GPO. It is used to to set our Proxy settings among other settings. Well apparently we had too long a value in the exceptions field which prevented the proxy from being properly applied and it would leave all the boxes blank even though the settings existed in the registry. After shorting the exception list, free busy would work again. It would also work if I manually turned off the proxy settings.
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smdh-isAuthor Commented:
Because it is the only answer that solved my problem
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