Outlook not accessing Shared Calenders

I have a client who is trying to access network calenders, he can access his own emails and his calender through Outlook perfectly, but he OCCASIONALLY can not access network calenders, with the error message:

The connection to the Microsoft Exchange Server is unavailable. Outlook must be online or connected to complete this action

As this is intermittent issue i dont have a clue because its not a simple issue.
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Hi tlcsupport,

This sounds like a network error? Does the user use a notebook?

It might be a network cable?
tlcsupportAuthor Commented:
No its on a PC, but its weird because he can always access his own stuff but its only occasionally that he can't access networked calenders.
If he's running in cache exchange mode, he will be able to access his own stuff even if he lost network connectivity. How intermittend is it? Any pattern?

Have you tried to change the flylead just-to-test?
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tlcsupportAuthor Commented:
No, it is running Cached mode but he has no problem sending and recieving emails, this issue only comes up when sometimes accessing network/shared calenders, everything else he does works fine, and everyone else can access the calenders fine.
Hhhmmm... This is a weird one. Did you try to recreate the user's profile?

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tlcsupportAuthor Commented:
I'd rather keep that as a last option coz they client fussy about that sort of stuff...

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