If you are having problems please do the following:

If you use Internet Explorer up 6.0:

Click on the Tools at the top of the menu.
Next select Internet Options

Then in the Temporary internet Files area click on the following buttons:

Delete Cookies..
Delete Files

Now close out of Internet Explorer and then try to re-logon

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If you use Internet Explorer 7:

Click on the Tools at the top of the menu.
Next select Internet Options

Then in the Browsing History area click on the following buttons:

Delete
Now in the Delete Browser History window click on:

Delete files...

Delete cookies...

Then click on Close and close out of your Interent Explorer and re-open it. Now try to logon to the Webmail.

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If you use FIREFOX:

Click on the Tools at the top of the menu.
Next select Options

Then in the Private Data area click on the following button:

Clear Now

Now close out of FireFox and then try to re-logon