Why am I getting an error “POP Lock” when I try to check my e-mail?

It is possible to get the following message when checking your e-mail using Webmail:

-ERR [IN-USE] .afarp.pop lock busy! Is another session active?

This error occurs when two different programs attempt to open your electronic mailbox. For example, you might have Outlook Express checking your e-mail every 5 minutes at home, while you try to open your e-mail (using Webmail) from work at the same time.
Another possible reason is that your Outlook Express crashed while trying to retrieve e-mail. In this case, your mailbox might have stayed open until it’s automatically closed a few minutes later.
A typical solution to this problem is to restart the program and/or the PC.

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