Outlook Personal Folder Error Message

[RMcI]

I have a number of Personal Folders where I store all of my messages that I
receive or send. Sometimes I am unable to expand these folders - the
following error message occurs:

Unable to expand the folder. The set of folders could not be opened. The
server is not available. Contact your administrator.

I am connected to the network, and am able to expand some of my personal
folders.

 

[DL]

If these pst's are stored on the network, such a cofigeration is not
supported by MS as it can lead to corruption of the pst

 

[RMcI]

These .pst's are saved on my PC - I use these so that I do not go over my
mailbox disk allowance on the network.

 

[Roady [MVP]]

It's hard to say what is going on without any configuration information.
Sounds like you are using an Exchange account though. Scan your ost-file for
issues with scanost.exe or recreate it.
See http://www.msoutlook.info/question/77

What did your mail administrator say about it?